There are many excellent books and on-line resources that give step-by-step "how to write a grant" information. A couple of good ones are:
The Foundation Center's Proposal Writing Short Course:
Takes you clearly and succinctly through the basic elements of a sound proposal (executive summary, statement of need, project description, budget, organizational information, and conclusion). Tailored more for proposals that will go to foundations.
Writing Effective Proposals (California Department of Education)
Overview of the components of an effective proposal, with an emphasis on the areas generally required in California Department of Education grants. Relatively short and to the point.