First off, good luck.
Second, there are alot of resources for basic grantwriting on the web. Here's
one from the South Carolina State Library in participation with the Foundation Center (fdncenter.org).
A book I like to refer people to is
The Foundation Center's Guide to Proposal Writing by Jane C. Geever.
In Canada, the Council for the Arts has
information sessions specifically on grant-writing.
Questions for you:
Were you invited to apply for the grant, or is it an open RFP? Your approach may vary slightly depending on the circumstances under which you are applying/are being considered.