Georgia has only 2 laws that regulate the purchasing of firearms. All other purchasing laws come from Federal law. The BATFE has a reference page that explains those laws (at that site, when the BATFE says "licensed" they mean firearm dealers and "unlicensed" means private individuals).
Straw Purchase / Anti-Bloomberg Law - Any person who attempts to solicit, persuade, encourage, or entice any dealer to transfer or otherwise convey a firearm other than to the actual buyer, as well as any other person who willfully and intentionally aids or abets such person, shall be guilty of a felony. (16-11-113)
Furnishing a Pistol to a Minor - It is illegal to sell or give a pistol or revolver to a person under 18 years old. Possession of handguns by minors is only allowed as explained in the Possesion section above. (16-11-101.1)