You also need to go to their website to get their witness forms and trip log sheets. You need to have the start and end witnessed, and the witness sign your forms. (Gas station attendant will do for end. Start should be someone you know. Witnesses cannot be on the ride with you. If you ride two up, you'll need a witness form for the passenger as well).
http://www.ironbutt.com/ridecerts/getdocument.cfm?DocID=1Get gas station receipts with date and time stamps at EVERY stop. If the pump doesn't have time/date stamp, go inside and get a receipt anyway. This is where the bigger stations come in handy.