"Family Store"... kids earn points at home for doing chores/good behavior and then turn in their points for items in the "family store" once a week. Ideas for items in the "store" could be things already around the house like, special snacks, stickers, drinks, notebooks, post-its, dollar store stuff. Use different color stickers to represent the "point value" of each item (point value key posted on side of box).
After the kiddos are done their regular chores they can pick a "work for hire" job to get money. Now that is a clever idea, the very sight of real money hanging before their eyes just might do a better job than the nagging does.
List of chores by age and how to SIMPLY organize them w/o a chore chart. (easy for kids & parents)... note cards in a basket that they pick from. One a day in addition to daily responsibilities, 2 on weekends, more for punishments.