But your idea may be so new that you may also need to talk to potential customers, host some focus groups, talk to an ad agency, or maybe even make a prototype and float it past some people. Be prepared to spend the time. Remember, it's not about the Plan but the Planning.
Internet Public Library - The Census Data and Demographics (ipl.org)/: An especially useful site that has links to information about countries other than the U.S.
Service Operation - If a service is offered, describe it. Will the work be done by company personnel or subcontracted? Who are the subcontractor(s)? If on-site or in cyberspace, what employee qualifications, equipment, and technologies are needed? How will quality be assured? What performance levels are anticipated per employee? Possible Data Sources: local Chamber of Commerce; yellow pages; trade associations.
Carrying on with the example of a coffee shop, a business plan consultant will figure out what the best location would be. They already know coffee shops do well in areas with a certain demographic in place. These include students and workers, who are within close proximity to book stores.