Hi- welcome!! Sounds like daycare found you
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As far as licsensing hopefully someone near you can advise-
I would suggest you look at writing a simple contract to start that includes things like days care is provided, payment required and when that payment is due (there you can change to ahead of time). Also add that by signing the contract the parents agree to the policies.
Policies is where you can get into more details- there is a ton of good info on here. If you have specific questions ask and someone will help
I personally, would write a letter to my current families once you know what your liscense process is and tell them you plan to change from what your currently doing to a daycare business. Then you can tell them all of the benefits this will provide their families
. I would give them the new contract and policies and a time frame in which they need to return them (with first weeks payment) to you to ensure their child's spot
HTH! And feel free to ask questions!