In addition to these fundamentals, you may also include a discussion of your marketing plan and plans for future expansion. There are numerous government websites with valuable information pertaining to small businesses _ make use of that information in your business plan. There may be sites that pertain to your specific business, and the Small Business Administration has a volume of valuable information pertaining to all start_up businesses. Additionally, depending upon the nature of your company, you may include additional sections as they pertain to the individual situation. Additional sections may include Products, Services, Distribution, Suppliers, Customers, or any variety of specialized sections that apply to your situation.
Another consideration. Should the business plan be a document that is focused on selling an idea for a product or service? For many years I worked in a company that did not want anything in a business plan that could be construed as showing a bias towards or against a project. The mantra was to only present facts in the business plan. The Operations Research Department was there to review the analysis as being unbiased. To handle the "what if" scenarios or sensitivity analysis we prepared a supplemental analysis documents which were mostly financial oriented. Personally, I like a factual approach and use the presentation of the final document to point out the conservative aspects of the content.