It becomes easy to communicate your ideas to the people you interface with, who in turn can give you better ideas or complement the ones you have. Collect all the material to one place. Having a business plan makes it possible to have all your ideas and plans in one place. It becomes easier for you refer to it and to use it to develop your business. You become a more committed business person and even others people, like your prospective financiers, can easily regard you as a serious business person.
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.