Wholesale contract example? Seller and Assignee only

[Meg Roman]

Hi - I'm looking for clarification on wholesale contracts. Each contract example that I've seen has three parties: Seller, Assignee and Buyer. If I understand the process correctly, I, as the Assignee, will first enter into a contract with the Seller. Then later enter into a contract with a Buyer and bring the two together in a double close transaction.  It seems like this process would require TWO separate contracts. Does anyone have an example of a contract just between the Seller and the Assignee, before there is a known buyer? Or do I have to sign a Purchase Agreement between me and the Seller? If that's the case, how do I protect myself and get out of the agreement if i can't find the right buyer?