Forms are available online at dol.wa. Gov or at any vehicle licensing office.• Never, never, sign a contract with spaces left blank. Mark them out or fill them in appropriately. 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. What forms must I fill out? How do I fill this out? Create a Washington bill of sale to document the transfer of ownership for vehicles or other personal property.