What is the best thing to do for sponsorship in racing?

Umm I'm no expert on this but I would have thought ring round some companies that you think might be interested in sponsoring a bike racer and then sell yourself to them like tell them how many people are going to be watching certain races and that you would be selling there brand of what ever it is they do by wearing logos and contact info and the like, maybe a local motorbike shop would be interested or you local motorbike repair shop? Then as you get better you could approach small 2 stroke oil companies perhaps? Hope it's gives you some ideas and good luck with your racing!