Oh, D., inspiring kids to complete chores and have good behavior is common. I'm a mom of 4 grown children now and I remember this same challenge. First of all, your setting a good example for them is essential -- your being busy yourself in things about the house getting "your chores" done with a good attitude, perhaps even singing, humming, smiling enjoying what you do - never grumbling. You have a lot of household chores yourself, simply because you have your lovely children, so serving them in a happy way, sets a great tone for them. Sometimes working together, having the children help you or you helping them is encouraging. Racing to see how fast we can get the chores done -- not competeing with each other, but trying to beat the clock. Think of ways to make work fun. Work is a good thing and should not be a time of drudgery.
I clean house for a mom who has a peg board for each child (like a wood coat rack with pegs, but small). There are an identical group of tags on each child's board with a chore listed on each tag. As each chore is finished they flip the tag over. When all are completed, the last tags are reward cards. I think they "collect" their rewards and after so many they get a reward. There is also a "good behavior" card that when the child does something exceptionally well (based on attitude), the parent plans an outing or something as a reward. (such as a one on one outing with parent). You could do your own system.
I remember a time when I saved a large Valentine Heart candy box, and put trinkets of interest in it. It stayed on top of the refrigerator and when the children were especially good or did their jobs especially well, or offered to help etc., they got to choose something. You can use your own imagination.
I think also, it's good to teach the children that chores are to be done before play.. do chores early in the day, and happily. Serving one another through our chores because we love one another and praising them for good attitudes goes a long way. Praising and thanking them when a chore is completed. I was far from being an organized mom and many times our house was a mess and I never fully accomplished getting my kids to do chores when they should, but everyone of our 4 children today have excellent work ethic today, and are treasured in their employments because they do their best and follow through til the end. Our children comment that their mom and dad worked and set a good example. I guess they learned the value of how they were shown and instructed even though it didn't show up entirely when they were at home. Don't give up. Be consistant. It will pay off.
L.