U.S. Census Bureau (census.gov): A source for a variety of useful statistics, especially the Economic Census that comes out every 5 years.
"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.
There are many advantages of utilizing business plans consultants especially if you are new trading. This kind of agent will take you by the hand and guide you in the hard tasks involving planning and starting up your enterprise. They can give you a hand when you're being lost plus inform you of the key official elements of setting up a firm which in turn if they're not used could quite possibly drop you in hot water. They might conserve your time, just by creating a plan to suit your needs it's going to free you up to get going with the practical activities.
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: