I really mean no disrespect, but if you prefer to have a one-stop source for all the information rather than having to read multiple threads, Atlas MAY not be a great fit. NOTHING he is one-stop and flight crews are left to fend for themselves and figure it out daily.
That said, look in the Hiring section and read the "Atlas Air Hiring" thread. ALL your questions are answered there. Read it all and you will have a very good picture of this place and how it has evolved over time.