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.
In Summary : Planning out your business on paper first gives you long-term benefits with potential investors, employees, vendors, and suppliers. The business plan becomes your roadmap to success, with pertinent data that shapes the course of your business start-up and lets you adjust your journey as contingencies arise. Business planning templates are readily available and data sources abound at your fingertips. You will achieve a solid understanding of your business as you work through each section of your plan.
U.S. Census Bureau (census.gov): A source for a variety of useful statistics, especially the Economic Census that comes out every 5 years.
While these are easily available online, some of them are way better than the others. A lot depends on the approach that goes into writing the business plan.