Hello. Thank You very much for Your answer Lowengard.

You wrote " There are many ways to handle this however, from a detailed and highly specific proposal, to a laundry list of everything you might ever do with a check off box to indicate which items are covered. "
So as I assume I can make proposal with list of items to create for client.
May I do it by myself creating checkboxes or should I do it with help of lawyer ?