my first deal, owner carry, large dp, need advice!

[Jennifer V.]

I'm seriously considering the following deal,
Condo in the French Quarter in New Orleans (400 square feet) which is typical for that area
Purchase Price $115,000
Owner will carry with 60K dp

I wanted to know what type of contracts i should look into, the owner is very flexible with payments, but I wanted to hedge my risk and put a stipulaion about finding a renter within two months in the contract...has anyone ever heard about these types of deals? It is ok to ask for that kind of condition?

Thanks in advance!