There aren't that many things you can do straight after your CPL. If you want to instruct you need an FI rating, to fly air taxi you require 700 hours total time etc.
The sequence of training consists of; PPL, 100 hours PIC (inc. 300nm cross country) and a night rating to start a CPL. 14 ATPL written exams. Then the 25 hour CPL itself (28 if including a MEP), a 55 (maybe 50) hour IR, and possibly an MCC although that is not required. That gets you a "fATPL", the f standing for frozen, ie. a CPL/IR.
To gain the ATPL you have to have 1500 hours total time, 500 multi crew on an aircraft of over 5,700kg.