Make sure you have 250 hours PIC which includes 100 hour cross country and 25 night time. Yes, you have to select a training center before you submit your TSA paperwork. The staff at most of the larger training centers can help with that. And yes, you can be issued your ATP and type rating in the same checkride. One thing to consider is if you take the checkride in an A320 the ATP will be limited to A320s only since you can't do some of the ATP maneuvers in an A320.