Yup, sure do! It's about 8 pages long and covers every scenario I can think of, LoL.
No, seriously, I am frequently updating the handbook. When parents get their paperwork, they sign off on an attestation that they have read the handbook and understand it's guidelines. It's an extension of the contract for me.
I think you should have one, since you will be dealing with many, many parents. Easier, and you can guarantee that everyone gets the same info.