Welcome to Chief Delphi! There is a whole forum section on fundraising and sponsorship that you might find helpful.
http://www.chiefdelphi.com/forums/forumdisplay.php?f=63
You might also like to download the white paper on "Creating a Killer Team Packet" which is to be used when approaching potential sponsors. It is available on the NEMO (Non-Engineering Mentor Organization) website in the
Resources section.
There is a lot of information on Chief Delphi that you will find useful. Please search the forums first to be sure that your topic hasn't already been covered somewhere else, then try to post in the appropriate forum for best results.
Good luck with your sponsor search!