Good luck with your new business and welcome to the forum. This is not an easy profession and people who open a daycare to make a little money soon realize that it is necessary to be more business minded and to have a contract and rules or people will walk all over you. It's sad, but it's true.

Be strict with the parents and enforce rules. The same goes for the children. You must start from day one to show children what is acceptable with praise and what is not acceptable with a stern voice and face, a timeout after a few warnings, whatever works best for you. But start today.