Well, there are washable paints that only need warm water and dish detergent to clean them. At the same time, there are homemade 'remidies' that can clean things like crayon off the walls.
Don't frett - Small children eventually grow up. In my home, we have this theory: As long as you clean the walls, they'll get dirty. BUT, if you wait long enough, the kids learn to speak and listen, thus, this 'problem' ends up fixing itself. Soooo, what's the theory??? DON'T do anything 'really nice' to the house until the kids grow up (a little.) (You can do a paint job now BUT I WOULDN'T get new carpets or furniture just yet. Remember, small children tend to 'ruin things'.)
Welcome to the club!!! Visit your local Paint Retailer (found in the YELLOW PAGES under PAINT - RETAIL) for paint and advice.
My best to ya and hope this helps.
Jay J -Moderator