Wholesaling Contracts

[Emojevwe Sowho]

I have been doing some research on wholesaling contracts and was hoping someone could better help me understanding. To perform a wholesale deal does the "assign to" contract cover the whole deal or do I need two separate contracts, one for the seller of the house and another for the investor that would be buying the house? Also is it recommended to go through an attorney to formulate the contracts or pull one from the web? Thank you for any help