Frankie,
I started my journey in November 2019, where I was able to put a deposit on a start date for July 2020. I wasn’t in a hurry and needless to say, a pandemic showed up not even a month after I talked with Admissions. What I would recommend is if you have a weekend or so, schedule an admission flight and training center tour, get that checked off.
After acceptance to ATP, put your down deposit to secure a class date and you will have access to ATP’s hundreds of resources which you can use to help study. For the Private written you can use anything from ASA to Sporty’s Study Buddy app, every written thereafter use Sheppard Air.
The only other things you’d have to accomplish before attending is a 1st FAA Class Medical certificate.
Brady