There are many reasons for utilizing such a document. Is the final document going to be about implementing a decision already having been reached or is it about analysis and recommendations for a newly proposed activity. As noted above, a finished document may be for internal or external purposes. Externally they are often used to solicit funding for a start_up or joint venture. Whatever the purpose, do not confuse effort with say, a marketing or a production plan.
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.