The purchaser's signature in section 3 is optional. You must complete, sign and submit a Notice of Sale to our office within 30 days of selling a vehicle, vessel or mobile home.A Florida motor vehicle bill of sale template legally transfers ownership of a car or other motor vehicle in Florida. A Florida bill of sale is a document used to transfer the ownership of personal property from a seller to a buyer. 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. Write out your own full name, and that of the buyer.