You son is 5 months old now, is that right? He's gotten past the newborn stage and is probably napping twice a day or so. Or he is taking a lot of cat naps. If he is taking cat naps, that's probably harder on you and on him.
It's good to get a baby on a schedule, especially one your son's age. I had the help of daycare ladies when my children were babies, because I was working. We got up at 6:30 in the morning, fed them and put them in the car and dropped them at daycare. At 5 months old, I was giving them a bottle when they woke up (I had already weaned from breastfeeding by then) and they had just started cereal and banana baby food and I took that with me to daycare. They fed them there.
I mention daycare specifically because they taught me how helpful it was for children to have a schedule. I saw the schedule they kept for newborns all the way through the 5 year old room - indeed, I felt like they were my childrens' "other mommies" and I missed them a lot when I became a SAHM.
They fed the babies who were now on cereal (like mine) when they got there. I would write down what time I gave my baby a bottle before I left, so 3 hours later, they would feed my baby a bottle. In mid-morning, they would put the babies in their cribs (after a bottle) for their morning naps. In between naps and feeding, the babies were in the floor for tummy time and exposed to manipulative toys for their age set. They played music and showed them colorful books. They held them some too. They talked to them and sang to them as well.
Afternoon naptime was the same. They wrote down when they changed their diapers so that I knew how many wet and how many poopy diapers they had, and what time the last bottle was offered. That way I would know what time to give another bottle when I got home. At 5 months, I was giving a vegetable (baby food) and cereal when I arrived home and a bottle. Then between 8:30 and 9:00, another bottle for bedtime.
If the weather was nice, a few mornings a week the ladies would put the babies in a type of stroller (Bye Bye Buggie) and take them for a walk down the street. They also sat outside with them in the play yard enjoying good weather in the shade.
So, for you at home, my recommendation goes along the same vein as the daycare. You wake baby at the same time every morning, feed and dress him. Unlike at daycare where the ladies' sole job is caring for children, you have to do things like wash clothes, clean kitchen and take care of your house, and shop and run errands. So you put together your schedule based around what your child needs. He needs to be fed before you go out. You don't want to go out when your child is supposed to be napping, if you can help it. Best is after the morning nap, or after the afternoon nap. Always make sure baby has had something to eat before going out, too. A tired baby and a hungry baby is a fussy and crying baby...
Right now, you want to feed at the same time and nap at the same time everyday. You want to make jaunts out short. You want to be very organized about going out as well. Have your stuff together, preferably in the car so that you aren't running around like a chicken with your head cut off. I used to make lists and keep a list in a plastic bag in my baby bag. I did a spot check of my list regularly of what was in the bag to make sure I hadn't forgotten something important. I'd make all the bottles the night before and put them in the frig so that I wasn't having to make bottles while dealing with the baby. I'd just warm it up in the microwave (you have to be careful about that. Daycare used a crock pot to warm theirs in, which is great.)
After about a year or 14 to 15 months when they drop to one nap a day, it's easier to have more freedom in going out and doing things with babies. They become a lot more mobile. But it's still very important to keep a schedule with snacks and meals and nap being at the same time everyday. It's also when you have to redirect, redirect, redirect when baby wants to do things he isn't supposed to do and not allow little tantrums and such. Consistency is the key, along with schedules.
Hope this helps,
Dawn