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.
So, what would your business look like over the next 10 years to give you that? Could you build a plan that would show exactly how your business could do that? It would show what your sales, fixed expenses, material cost, labor cost, and variable expenses would need to be. It should also show you how many customers you would need and would show you what your profit and profit margins would be each year. All it takes is your current business numbers as we listed earlier and you can make a business plan as many years out as you like.