By making a business plan, you can pick out any potential flaws that might hinder you. It's a good chance to find any problems or issues that may arise, and then deal with them accordingly before you get caught up in the business. Also, outside parties can cast a fresh eye over the plan, and may pick out something that you may not have spotted.
Thoroughly cover your business' market. Talk about your industry and use specific details to support your statements. Details like industry size, growth rate and customer group will help you showcase your business. Include as many details as possible. Do not fill this section with generalized information. Make sure it is industry and business specific.