If you have an iPad with Foreflight you may be surprised how not that different an analog cockpit will be. You'll still want to know and have readily available the best rate of climb/descent etc. for the aircraft, maybe make a little cheat sheet.

I have yet to hear anything good about ATP Flight School. Whether as a student or CFI there are lots of horror stories. They're also the most expensive school to get your ATP. I'd consider other flight schools in your area. If your intent is to become a CFI and hope to be a CFI at the school you graduate, pick a school where flight instructors are logging 90-100hr averages a month to get an idea of what you can expect to fly when you become a CFI. The general consensus from ATP CFI's are that they are overworked, mistreated by management and under paid by a lot compared to other schools.

As mentioned be very careful when accepting airline partnerships or cadet programs. Often these programs include years of commitment to a regional airline before you'll be eligible to flow to a major airline. Any bonuses offered in the event you decide to leave prior to fulfilling your contract will require to be repaid. The quickest pathway to the majors isn't necessarily from say Envoy's four year flow to American. Many majors are plucking competitor's regionals or hiring LCC pilots from Spirit or Frontier after two years.

United's Aviate Academy has had so-so reviews from pilots here. You'll be required to have your covid vax going through their program -if that matters to you. Just a head's-up.