If you're looking for a meeting place or a good stop around ½ or halfway between Atlanta and Live Oak, FL, you can try Cordele, GA, which is about 2 hours south of Atlanta, or about 2 hours north of Live Oak, FL.
About ¼ or a fourth of the way, you can stop at Macon, GA. This is about 1 hour southeast of Atlanta.
About ⅓ or a third of the way, you can stop at Warner Robins, GA. This is about 1½ hours southeast of Atlanta.
About ¾ or three fourths of the way, you can stop at Valdosta, GA. This is about 3 hours south of Atlanta, or almost an hour northwest of Live Oak, FL.
If you drive straight through without stopping at all, the total distance is 273 miles. The distances shown above don't include local roads to get into each town, so if you're planning a long road trip, make sure you factor in traffic and road conditions, rest stop breaks, and interesting detours along the way. If you're in a rush, you can do the trip with zero stops, and your total travel time would be around 3 hours, 56 minutes.