There are no rules about what your plan should cover or the level of detail. In general, plans need to include information regarding:
~ business profile
~ vision, mission and
~ market research
~ operational strategy
~ products and/or services
~ marketing plan
~ financial strategy.
Business plans may be internally or externally focused. Externally focused plans target goals that are important to external stakeholders, particularly financial stakeholders. They typically have detailed information about the organization or team attempting to reach the goals. With for-profit entities, external stakeholders include investors and customers. External stake-holders of non-profits include donors and the clients of the non-profits services. For government agencies, external stakeholders include tax-payers, higher-level government agencies, and international lending bodies such as the International Monetary Fund, the World Bank, various economic agencies of the United Nations, and development banks.
That doesn’t mean you have to bust out Word and start the plan from scratch. A template is great--you probably aren’t doing anything that hasn’t been done before, so it provides a proven structure for your plan. Pretty much everything on it can be customized.
Sample business plans and templates can help you develop a professional document that will serve as an in-depth marketing tool to convince others of your venture’s potential for success. However, creating your own plan can be a complex process, and you may need the assistance of a professional (like an accountant) depending on the type of business you have (or want to run), and what you are seeking in terms of investment.