"Plans are useless; planning is indispensable," according to Dwight D. Eisenhower, then Commander of the Allied Forces in Europe during WWII. Now, you may be in total agreement with the first part of that statement, but you are really not convinced of the truth of the second part.
Industry Analysis - How does your product or service compare with what is currently on the market? What is the trend in the overall industry? What have been the total sales in this industry over the previous 3 to 5 years? What new products or technologies have had the biggest impact on this industry recently? What is the future outlook for these and what trends are emerging? Who are the competitors, where are they located, and how are they doing? What advantage do you offer over them? Who is buying this product or service now? Describe the typical customer for this product or service.
You can find a variety of companies online to help you with your market research. For example: Sundale Research's (sundaleresearch.com) primary goal is to provide new and mature businesses with objective, accurate industry data and market analysis on a wide range of topics. Their market research is intended to save you time and money while keeping up with industry trends.
Maybe it's okay as an assignment for an MBA class, but it would be just too confining and irrelevant for today's fast-paced business environment. Anyway, you're ready! You've thought about this business venture for a long time and talked it over with friends and everybody agrees it's a great idea. Best to strike while the iron is hot!