I suggest you might first try Prince George County, Virginia. There is a 1766 ad for a runaway slave published for John Laforey at "Maycox" in Prince George. Maycox was an estate on the James River---although it was associated with the John Ravenscroft and David Meade families. The following is a link to folks interested in the Laforey name there and in the Caribbean:
http://search.ancestry.com/cgi-bin/s...e+George+Board
You may find some information about the family, but you will be hard-pressed to find anything personal about a young man. Church records seem like the only possibility (apparently, the Laforeys were Huguenots; but who knows what church? You might try Chamberlayne's "Births from the Bristol Parish Register of Henrico, Prince George & Dinwiddie Counties, Virginia, 1720-1798."). Among government records, you may find land transactions ot trusts, but they would presumably relate to Laforey's father. Real and personal property and capitation taxes would almost certainly name only the head of household.