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"I Have A Great Idea!"

Good for you. Now write it down.

Opinions expressed by Entrepreneur contributors are their own.

Don't try to keep all your vital business data inside your head. Write it down in a business plan, or at least keep notes in a computer file or legal pad (and store it in a safe place). Potential investors will want to see a business plan anyway, and by writing out your idea, you'll have a clearer and more organized view of your new business.