(City), (State, Zip)
Dear (name of the person),
Here you should introduce yourself and the group that you represent.
In the second paragraph, you want to request the sponsorship, and spell out how the funds from this
sponsorship will be put to good use.
Over here, you will need to tell your potential sponsor how his company will benefit from sponsoring
you, and what all you plan to do so that the sponsors get the most publicity.
Here, you should include basic details of the sponsorship deal, and also request that the potential sponsor
fill out the necessary form and details.
Lastly, you need to thank the person/company that your letter is addressed to.
(Position in the Organization)