Hey Nick,
What I normally do is send the client a proposal. Let's pretend it's for one morning sunrise shot of a construction site. In that proposal I put in the client name, date, when I will fly (if there are a range of dates based on the weather being good), pricing for the flight and a section on Rights. Under Rights it depends on the client - if it's real estate like a home, I just say the client retains the rights to use the footage and post it on whatever sites they wish as well as add whatever titles they need to in order to sell the home. I usually do that for them so they never