I try to use the Love and Logic approach which means I try to find a consequence that fits with the misbehavior. I think this fits the learning model best. For example in the situation of not being ready to go in the morning, you all go at the correct time. If she's not dressed she goes in her pajamas. I'd let her grab her clothes, or have a sack of clothes that I'd prepare ahead of time in the car, and get dressed in the car. I'd be aware that she's going to be very unhappy and stressed and prepare myself to have deaf ears to her complaints. Just telling her that this is what will happen may speed her up but don't be surprised if she tests it. This is a really hard one with which to follow thru.
I've not had 4 children with whom to deal and so I haven't had to use this. When I realized that my daughter wasn't going to be ready, I'd dress her and I've done that with my grandchildren. Once they're too big/strong for me to that and fight me I've told them that I'm leaving and head for the door. It's surprising how quickly they can get dressed.
If you don't have to be somewhere on time, let them be late. My mother did that with me. I was so embarrassed that after 2-3 times I hurried up.
My daughter let's her kids watch TV once they're dressed, eaten, and ready to go. She says that incentive works most of the time. The difficulty she has is trusting that they're ready when they're watching TV. She;'s found she has to check them to be sure.
Do you know why they don't get ready on time. Devise a consequence related to that. It helps to have outfits layed out the night before, homework in the back pack sitting next to the door, lunches made and in frig. Breakfast planned the night before. It might help to give the oldest 2 responsibility for doing those things and then giving them a reward ("payment" for the job) such an extra 30 minutes watching TV or playing on the computer.
Loss of privileges doesn't have to be immediate. If they aren't ready to leave then when they come home they have to do a chore related to what caused them to be late. Or if they didn't get up in time they do have to go to bed earlier. They don't have to go to sleep. They just have to rest away from the rest of the kids. If they couldn't find their shoes, they have to pair up all their shoes and put them in a specific place. IF they were squabbling, they have to be in separate rooms for a specified amount of time. When the consequence is related to the behavior it's still a learning experience when it's applied later.
Following instructions seems to be really difficult at these ages. A suggestion I've heard and read many times is to make a list of everything that's to be done in the morning. Have a separate list for each child. Make the list with each child. For the 6 and 7 yo, have them actually write down the list of things they need to do in the order they need to do it. If they have a sense of time, have a large visible clock and write down times each task is to be completed by. See if that helps.
I've noticed that most homes are chaotic in the mornings. If you can get some order going the kids will be better able to handle themselves. I remember when my daughter was getting herself ready and expecting the kids to get themselves ready at the same time. Now she tries to be mostly ready when she wakes up the kids so that she can participate with them in getting them ready. It's not a total solution but it helps.
Kids this young just do not have a good sense of time, how long it takes to complete things, or even the ability to focus in the midst of noise and confusion. They might hear but their minds don't hold onto what they've heard. And their minds aren't agile enough to consider several things at once.
My daughter fights a lot with her daughter over homework. She reminds, nags, gets cranky trying to get her daughter to get her homework done. In this sort of situation I believe that the parent's only responsibilities are to provide a quiet place and supplies to do the homework and to have a specific time to do it. Then be available for help if they're asked for it. There already is a natural consequence for not getting it done and that takes place at school. I would add that for incentive the parent can say that they can watch TV once the homework is done.
I remember, as a mother, I felt that my daughter had to have a good breakfast before school and so I'd nag to get that done. Now I think that it's important for the parent to have a good breakfast available but it's the 6 and 7 yo child's responsibility to eat it. Going to school hungry a couple of times would be an incentive to eat.
Same with homework. I'd take it to school when she forgot. Now I wouldn't.
It does help me to more quickly think of a natural consequence now because I've had more experience doing it. At first I was often caught at a loss at that point in time. I suggest thinking thru the misbehaviors you're most concerned about and making yourself a list of natural consequences
In a Love and Logic workshop they taught that it's OK to say to the child that I have to think about a consequence. Also it's OK to say to the child, what do you think the consequence should be? In fact it's sometimes best to sit down with the children and brainstorm together about consequences. They are often harder on themselves than we would be and when they've come up with the consequence it has more meaning to them.
About breaking things: Do you mean that they purposely break things or they're not being careful. There is a difference between the two causes. If it's because they're not being careful the natural consquence is that after they break the first thing they aren't allowed to use other breakable things. No more opening and closing the drapery. An immediate time out if you see them opening the drapery after that even tho they don't break it. How do they break a table?
It is expected that children as young as yours will be careless and break things that are fragile. Because of that I believe in child proofing a house as much as possible. I put away anything valuable or important to me. My venetian blinds are old and cranky. Kids do not touch them. My daughter did break a coffee table when she was rough housing and fell on it. She didn't get into trouble. Accidents do happen and I do allow rough housing. I did have her help me repair the table.
A friend of hers broke a hanging lamp shade by jumping and grabbing onto it. She felt bad and so I didn't do anything there either. Even tho she was 10 I understood that she didn't realize that the solid glass shade would break. Kids are careless. They are in the process of learning that things are breakable and how to prevent them. Prevention is my goal and so I calmly talk with them about what happened and how they can behave so that is less apt to happen again. I do cut eveyone, kids and adults, quite a bit of slack. An adult friend tripped and broke the plate she was carrying and a collector plate on the wall. It was an accident. I didn't expect her to pay for them.
Respect of both people and things is taught and mostly taught by example. That means to me, that I need to respect that accidents do happen and that kids are learning which means I show the kid respect by first assuming it was an accident and not getting angry. Then to talk with them in a respectful way about how to treat specific things. You might also have a rule that there is no rough play in the living room. If the item is broken because they violated that rule then a consequence could be that they sit down in that room in a quiet and respectful way. This is a variation of time out. Because you're having them do this in the living room and stating it's to be quiet and respectful in the manner expected it's also a learning experience.
I, too, have found that losing privileges at these ages has very little meaning. It's a more effective technique with tweens and teens.
One thing my daughter does is to give her kids another chore if they don't complete the assigned chore on time. To my surprise, my 9 yo granddaughter likes to do chores and so volunteers to do another chore. My daughter doesn't seem to have difficulty getting chores done. She doesn't give the kids very many chores anyway. She says they have one each per night but I've not seen that happen. :):)
Which reinforces my philosophy that I have a choice of whether or not I get upset about something. The more I can stay calm and use a respectful tone of voice the less often the kids seem to act out. This has been hard for me to develop. I came from a family that yells and yelling has been my first response all together too often. It's easier for me now than when I was the mother.
Consistency is important. Have consistent consequences happen is important. Have the same consequence all the time is not so important. The goal of consequences is to teach good behavior. A child may need to learn something different this time than they needed to learn last time. Flexibility is important.