Researching the history of a family should involve a thorough search of county archives, e.g. mortgage, land conveyance, Surrogate's Court record, etc. These are the best official sources available to establish family origins, locations, and connections. Some towns have obscure holdings ca. The Mormon Church , a.k.a. It has its Family History Centers spread out all over the world.
Access is free.
Much of the information in their databases is not documented, but it provides a good start. Many vital records and books on microfilm can be rented. I will utilize their holdings for a client on request, but usually advise individuals new to research to try it themselves. It's free and the centers are usually staffed with volunteers who will help you. A stated limit to the initial amount of hours to be spent researching.