You'll need to sign the car purchase agreement (or dealer bill of sale), the title, an odometer statement, and sometimes a damage disclosure statement. 1 If you're financing your purchase ; 3 The actual vehicle purchase agreement ; 4 Buyer's trade in certification ; 5 Warranty disclaimer and documentary fee notice.The buyer's order includes detailed information about the car you are buying, including the VIN, color, make, model, options, features, and warranties. Information you can expect to fill out includes the car's VIN, make, and model, the name and permanent address of each party involved, and the sales amount. Watch this before you finance your next car (former dealer explains how to read a purchase contract) The credit price is shown below as the "Total Sales Price. " The "Cash Price" is also shown below. How to fill out the Motor Vehicle Purchase Agreement Instructions? You can prepare an Agreement for a Joint Purchase using the form included here. Simply fill in the details of your joint purchase.