You are worrying about this -get me to ATL- thing wayyy too soon.
There are many guys stuck in NYC who have been there for years, on the bottom. They are ahead of you, they will get back to ATL before you, so don't sweat it.
You'll have plenty of time to figure it out when you get out of school and hit the line. That's when you should start asking questions of the other pilots you fly with, they can fill you in.
Welcome aboard, it's been too long since DAL did any hiring, we are all glad to see that again. I hope it continues but it sounds like they have already shut it down?