creating an acceptable use policy

I realize this is not a techical question, but can you offer any guidance on how to create an acceptable use policy (which I think is the same as terms of use, no??) for a multisite etsy-like marketplace. I've found some links in here to places that offer a plugin to put a link to the doc in the checkout process, but I don't see much on actually writing the document. I'm sure it will change over time, but I need a first iteration to sign up with PayPal. Should I copy Etsys' and edit it? Thanks