BC - I didn't do either. My DVC owner had recently purchased, so had never rented their points before - no references. I've only seen posts to rental threads, someone says they rented from this person. We didn't do a contract, just followed the guidelines on the DVC Rent/Trade (static thread at the top of the board). I've seen links to contracts on threads in the Disney Vacation Club Forum. Sorry I can't point you directly to the contract thread, I didn't bookmark it.
Before I rented, I spent a lot of time browsing the DVC boards here to get an idea of how people liked it and what problems they had.