Think of it as a written elevator pitch (with more detail, of course).
Entrepreneurs are by nature confident, positive, can-do people.
After you objectively evaluate your capital needs, products or services, competition, marketing plans, and potential to make a profit, you'll have a much better grasp on your chances for success.
Creating a business plan lets you spot opportunities and challenges without risk.
Use your plan to dip your toe in the business water.