Prepare a bill of sale for the buyer. Include the date of sale and the price paid.Complete the Title: The seller must sign the title in the designated area. The Electronic Registration and Title (ERT) System allows you to complete and print an Application for Vehicle Transaction(s) (VSD 190) online. An Illinois motor vehicle bill of sale documents the purchase and sale of a motor vehicle between a private seller and buyer in the State of Illinois. If there is a lien on the vehicle, the seller must notify the lienholder and obtain a lien release before completing the title transfer. Currency Exchange is the way to go. This is the motor number or serial number required for identification purposes.