If it is an airline pilot, you are talking about then it is extremely competetive to be one......
you could start by training for a PPL (Private Pilots Licence) at about £4,000 which is the basic thing whereby you can only fly small single prop planes- like the small 2 seater ones....... then theres lots of other licences you could obtain aswell for even more money
you then do the ATPL licence which costs another bomb......... you could then join an ailine training scheme sponsorship thing which costs around £60,000
you have to pay loads and takes ages and theres an extremely low number of places available.... After that you may get hired by an airline.
You need very good A-Levels, such as Maths, physics and english, and maybe a university degree
Depending on the airline you could be starting on around 25-40k, and earning up to 120k after loads of years
I'm sure someone else can give you a better insight into it all!