GFL is a Georgia Firearms Licenses which is now called a GWL or Georgia Weapons Licenses.
I don't think you will need a GWL, but you are eligible for a GWL. I would apply for a GWL just to be safe.
No classes are required for a GWL. Look up GA Senate Bill 308 for specific requirements concerning eligibility and specifics about GA gun law.
Anyone traveling in a vehicle in GA who is eligible for a GWL may carry a loaded weapon openly or concealed in their vehicle.
A GWL allows Open and Concealed Carry.