Most big companies will post sponsorship openings on the net, some will even have applications. Smaller local busineses will usually accept a resume. I've been researching sponsors myself latley, most companies would like to see at least this basic info:
6.Paragraph-what you can do for them?
7.Races you will be participating in
Not necessarily in that order though. Not all companies will look or respond to your resume so the more you hand out the better chance you have. Good luck.