It Doesn't Have to Be 100 Pages...
Every small-business advisor, every small-business book will tell you to write a business plan -- and they're all right. It doesn't have to be 100 pages long, but it does have to be thorough. Your plan should explain how your business will work, discuss your competition, and suggest how much money you'll need to get it off the ground. Check out the small-business section of your local bookstore: there you'll find numerous books on this subject.