There isn't a genealogical society for PG but there is a new historical society but not sure the help that will be. There are many church cemeteries and Blandford is the largest and one of the oldest in the area. The best bet is the Virginia Library and census records. PG County (http://www.princegeorgeva.org/Index.aspx?page=38
) doesn't have much before the Civil War as it was burned as many in the area were.