Questions about finding a sponsor?

[KC Kings]

YATALL (Yet another thread about little league)

I would like to find a sponsor or sponsors for my little league team, but don't know what the best method is to do it. I bought uniforms out of pocket, but am untested in getting a sponsor to buy our hats in return for getting a logo on the hat, or getting a sponsor to donate some money for tournaments in return for getting their name on a banner (BigRed's team site has a lot of sponsors on his banner).

What is the best method to get a sponsor? Since fall ball points count toward next years spring ball, would a sponsor have a "contract" until after next spring? Should I try to "sell" a full banner with the sponsors name for X amount of dollars, or sell smaller portions of space on the banner for a lessor amount of dollars?

I would like to draft a letter and personalize it to each business asking for sponsorship, that includes the amounts and what they get in return for each level of sponsorship. The only other people I know with sponsor have a relative that sponsors them and it isn't very official. I have no problem going door to door asking for sponsorships, but want to make sure I am going about the right way.

Thanks