Real businesses are often subject to regulation, and the best source of information on regulations are state and local government web sites.
There are organizations that can guide you in starting a new business. At UMass Dartmouth we have the Center for Innovation and Entrepreneurship (CIE) and some of the organizations they host, such as the Southern New England Entrepreneurship Forum (SNEEF). You should also check with the Small Business Administration (SBA) and SCORE if you want to build your business in the real world. Find regional offices if you are not located in southeastern Massachusetts.