The completed form will include a description of the watercraft, the purchase price, and both parties' signatures. Make 2 copies of the Bill of sale, 1 for you and 1 for the buyer.Go to your bank and pay off the loan and deposit the balance. Before filling out a bill of sale, you need the names of every party involved. I'm buying a boat from a private seller in Alaska. It is already registered and the seller will prepare documentation to transfer the title. In this video, we'll guide you on how to fill out, Boat Bill of Sale!