Go to OATS, Cabair, Bournemouth Commercial Flight Centre and basically any other advertiser in Flight International who run ATPL courses. Go to the free seminars and you'll find all you need to know.. .. .Briefly though you'll have to take 14 Ground Exams followed by some flight training in order to complete a commercial flight test. Then some more flight and simulator training in order to take an instrument rating test. After all this you will have a large debt in the region of say £40k or thereabouts.. .. .Then the hard work begins and you have to find a job as a "fully grown up airline pilot"... which anyone will tell you is not easy at the moment.