James J. Hill Reference Library (jjhill.org): One of the nation's premier business libraries to bring you FREE and affordably priced tools and resources you can use to create a better business plan based on relevant and credible data.
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. Performing keyword searches on Google, or Ask will bring up websites to check out. Following are some places to start:
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.
Corporate Information (corporateinformation.com): Features information summaries on over 350,000 companies in the U.S. and abroad for competitive analysis.