Basic Contract Terms. Sales agreements or contracts should include the following minimum information: Complete names and addresses of buyer and seller.A New York boat bill of sale is a document recording the sale of a boat between a seller and a buyer. How do I fill this out? Owner states that this boat is sold free and clear of any liens, bills or encumbrances of any nature except as stated below. Complete the Questionnaire and Purchaser's Affidavit. You also may have the seller complete the Seller's Affidavit confirming the purchase price.