Where can you find samples of a business plan for a small business? If you go into any of the search engines such as Google or Bing and type in "samples of a business plans for a small business" you will find websites with this information. This is why it is important that a small business should have a business plan. If you look at those small businesses that are successful, you will find that most of them all started with and have a plan for their business.
If a document needs to be developed that requires input from other disciplines_Finance, HR, Property & Facilities, Marketing, Procurement/Supply Chain_ then most likely you are looking at a team building effort to get the job done. In any event, don't look at the task as only as a roadmap that leads to a profitable product or enterprise. Business plans are a great way to build team buy_in, force a thorough review of options, define objectives, establish benchmarks to judge performance, and help arrive at a plan_of_action. Ultimately, it can lead to a Project Management approach to implementing a plan and that can be as involved and detailed as is necessary.