Hello there,
Essentially the best thing I can recommend is looking at flight crew schools such as the pilot training college, Oxford aviation academy, ctc ect. Request some information off them via post and have a good read through and see the courses on offer.
If you go at it alone, you would need your ppl. Comertial pilots licence, atpl-airline transportation pilots license. Then a type rating for the appropriate aircraft you would get employed to fly. And a tone of hours. Get a few flying lessons. I didn't the same when I was 14!