Braves fan coming in peace.
If you guys are wanting to meet up and sit near each other at the game, this is what I would do (it's what I have done to sit with people from a Braves message board):
1. Get the MLB At the Ballpark app on your phone.
2. Purchase cheap tickets off StubHub to get you in the park.
3. About 20 minutes before the game, use the At the Ballpark app to upgrade your tickets. (you'll show the usher your confirmation on your phone and it will act as your ticket)
You can choose your group size and location in the park from within the app and purchase tickets there. A friend of mine got tickets off StubHub for $6 each to get us in the park and then we paid $19 each on our ticket upgrades and sat about 10 rows off the field behind the 1B dugout. ($80 face value tickets)
If you have a relatively small group, you should be able to sit anywhere in the park for pretty cheap. Larger groups may need to choose OF or 2nd level seating.