Nice to have you with us. Here's a link to the forum care sheet which is always a good read. Feel free to post any other question to the forum members. We will do our best to give you some prompt answers. Chris is spot-on with his information on the species you have.

I called The Georgia Dept. of Natural Resources and spoke to Miss Hawkins (Special Permits-770-761-3044) According to her you may not keep any native non-venomous snake as a pet. They can only be kept using an "education permit". I asked her if that included any subspecies of Thamnophis sirtalis. She said yes. I pressed her with an example of T.s.parietalis - Red Sided Garter that doesn't even range in GA. She said "rule of thumb is NO" I then asked about T. radix - Plains Garter Snake which doesn't range in GA. She seemed unsure as to what to say and referred me to the State Herpetologist (John Jensen 478-994-1438) I called that number and Mr. Jensen is out of the office until Monday. I will try to make contact with him next week.

Here's some info. I found very surprising. No permit is need to keep a native venomous snake So, keep all the venomous snakes you want but don't you dare keep a garter snake.
Garter Snake Forum - Garter Caresheet