Wholesaling sub2 help!!!!!!

[Claudio Goedhart]

I have some questions on exactly how does sub2 work, I have a property under contract for 125k and a buyer for 130k but wants to do an owner finance deal. What type of contract do we use to assign and I have a regular simple purchase agreement with the seller would I need a different document? and also would we just get paid from the down payment if she is paying monthly?