I live in the Piedmont area of Virginia and only an hour and a half from the foothills of the Blue Ridge Mountains. I recently found a number of what I believe to be petrified wood specimens. There is also a lot of quartz in the area. I am curious about the types of rocks, and other geological formations that may be found in my area.
Your local university likely has a small natural history museum in its geology department. These are generally free and filled with information regarding local geology. I'd start there.....and bring your rocks; the attendant might be able to help you find someone who can identify your rocks.
The Roadside Geology of Virginia by Keith Frye is one of a series of books about geology in different states. It probably would be a good place to start to explore different geologic features.