Alyssa,
Just to clarify what the others are saying, upon graduating from the ACPP from ATP, you will still need to build flight time before you can jump into the airlines. How you want to build that flight time is ultimately up to you; the most common method is flight instructing, while there are other avenues such as banner towing, aerial photography, surveying, etc. Below are two screenshots, one of which includes the summary of hours and certificates upon finishing the program and then a screenshot from 14 CFR 119.1e which provides some of the named ways to build flight time:
Living in NJ your options are wide open for airlines, if you aren’t picky and are more worried about base choices. ATP provides a domicile map for airlines which you can see from a wide standpoint of where airlines operate their hubs. Simply putting it, American, United, Frontier are some of the main hubs based in the PHL & EWR area, within reasonable drive time from NJ.
Ultimately, I would find a flight school and/or location that is most convenient for you. Knowing ATP’s map, you have Trenton, Caldwell and Morristown (located in NJ) and just across the river you have Northeast Philadelphia. As a former Trenton alumnus, I can say that being located within two Class B airspaces provided for a lot of communication practice (and yes communication is EXTREMELY important in this field) and good practice area spots to fly around for maneuvers. I still chuckle every time I come up the east coast and fly over Millville and point out where I did my 8’s-on-pylons and ground reference maneuvers for my commercial checkride.
Brady