The vendor of the available business will need to see this in order to ascertain whether you are right to buy. It will demonstrate whether you have the correct business acumen required and whether you are serious about the business. It will also be useful when it comes to the financial side of things, but more on this in a minute.
So why make a business plan? I want to show you a totally different kind of business plan. What if you made a business plan that focused only on what you want for your life? You have dreams about what you would like your lifestyle to be, right? Why not make a business plan that could give you those dreams? What would your business look like if it gave you exactly what you want in life. What kind of salary would your business need to give you? Why not build a business plan around that? Decide how much salary you would need to support your dreams and then build a business plan that would show exactly how your business could give you that. Wouldn't it be better to have your business work for you instead of the other way around?