U.S. Census Bureau (census.gov): A source for a variety of useful statistics, especially the Economic Census that comes out every 5 years.
After doing this, they will give recommendations based on what they find. If there are coffee shops already in place, one recommendation they might make would be to include free Wi-Fi as a way to bring in more customers.
Risk Assessment - What weaknesses are inherent in this venture? What vulnerabilities face this type of venture? What impact will these have? What new technologies may affect this venture over the next 1 to 3 years? What contingency plans are in place? What level of liability insurance is required? What does it cost? Who is the carrier? Possible Data Sources: trade associations; trade journals; Service Corps of Retired Executives (SCORE); industry salespeople; customers; focus groups.
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.