Some small things to think about:
1) custody disputes are a pain in the butt and you are now part of it
2) going on the theme, who picks up the kid is actually more complicated than just the employee who drops the kid off (come in early with Mom, but get picked up by grandparent to be with other kids is not uncommon) - get this crap in writing
3) get the food correct for the children - you need to feed them - you are now running a restaurant
4) Lysol - wholesale purchases
5) Make sure you follow all codes and do the required number of fire, tornado, etc. drills
6) Read the Early Head Start and Head Start staffing guidelines as many places require you meet those. Also note, those flexible Silicon Valley hours are going to be amazingly fun with staffing requirements.
7) Security camera setup with DVRs - should go just fine with the webcams
8) Be a nice employer and do the assessment tests for your staff
9) know the facility requirements in detail.
If you spend the time and money on setup, you will have an amazing workplace. If you half-ass it, you will be sued a lot.