Business planning is about results. A business plan is any plan that works for a busines to look ahead, allocate resources, focus on key points, and prepare for problems and opportunities. Business plans are not only for starting a new business or applying for business loans, but they are also vital for running a business, whether or not the business needs new loans or new investments. Businesses need plans to optimize growth and development according to priorities.
A simple startup plan includes a summary, mission statement, keys to success, market analysis, and break-even analysis. This kind of plan is good for deciding whether or not to proceed with a plan, to tell if there is a business worth pursuing, but it is not enough to run a business.
Your plan will depend on your specific situation. For example, a description of the management team is very important for investors while financial history is most important for banks. However, if you're developing a plan for internal use only, you may not need to include all the background details that you already know. Make your plan match its purpose.
Write a business plan
http://www.sba.gov/smallbusinessplanner/plan/writeabusinessplan/index.html