It's also important to show the business plan to the vendor or bank manager. If your business needs financing at the beginning, then you need to turn to one of these sources for financial assistance. With that in mind, you need to produce a detailed business plan that shows that your business is credible and also has potential for making money. Not only does the plan prove that you are serious about the business, it also shows that you have a sound business mind and a good grasp of what needs to be done in order to achieve good profits.
You may find that the easiest part is the actual writing of the plan. The real work comes in the data-gathering, which may take you a hundred hours or more, depending on what you already know or have researched. If your new venture is in an area where you've been working, you may already know about your customers, your suppliers, your marketing plan, your organizational structure, your financial and cash flow needs, equipment, inventory, and so on. If you know all of these except for Marketing, say, then this is where you will need to invest some time and effort. You can find a wealth of information by utilizing the traditional data sources such as chambers of commerce, major cities' websites, trade associations, the US Census Bureau, trade journals, magazine and online articles and advertising, etc.