There are quite a few good books out there. I have a great one - but I just moved and I'm not sure where it is! Try out amazon.com and look in their used books, then you can buy several for the price of one new, lol.
I was a Preschool Director for 4 years and a teacher for 3 prior to that... I'd love to have a home child care business some day! I tried now, but my apartment management said no way in you-know-where!
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I can say the best thing you could do is to make sure you have a policy handbook covering every situation you can think of and make the parents sign. And stick to it. You are a business, not a free program, lol. I might suggest going to a few childcare facilities and pose as a parent seeking care. Pick up their registration forms and their policy handbooks and use for your own handbook what you like from their forms, using them as a template.
See if there is a Child Care Resource & Referral agency in your town. Mine here in Phoenix, AZ is awesome! They help with the licensing procedures, finding liability insurance, planning menus and give suggestions for the business end of it all.... a fantastic resource!!! And call Child Care Licensing and see how they can help you get started, make friends with them, they really do care about helping to create quality child cares!
Good luck!