According to O.C.G.A. 19-5-2, you must reside in the State of Georgia for a period of six (6) months before you can file for divorce. You would need to file the Complaint for divorce in the county in which your spouse resides.
If you live in the State of Georgia and your spouse resides out of state, you can still file for divorce in Georgia in the county in which you reside; however, your spouse would need to waive jurisdiction and venue in the state and county where he or she resides.