When you're writing a business plan in a situation like these, you need to address a few issues the intentional entrepreneur has already pondered. The first is do you really want this idea to become a full_blown business? Certainly it's flattering when you realize there's a market value for something you were doing anyway, but that doesn't always mean you should launch a business. A lot of accidental businesses form around fads or seasonal items, and may not be robust enough to function as year_round, money_making, enterprises.
Strategic Planning & Goals: The first step is to identify the key company goals which will be the over_arching direction of the plan. These goals should be focused on three areas: financial, growth initiatives and alignment to the company's vision/mission. This provides the overall direction of the company by establishing high_level goals that will be achieved by tactical initiatives. The overall plan should be 1 to 3 years with measurement mileposts monthly, quarterly and annually. While the plan is put in place at the onset of the year, it should be constantly re_forecast with actual results throughout the year.