Stuart hello,
First of all start looking into flight schools. Then start educating yourself on the daily life of a pilot. Look at all the good and bad.
You will have bad sceds for many years until you build senority and so on. You will be gone from home quite a bit also.
There are many books out there. Like so you want to be an airline pilot. Just educate yourself and then go for it. I think it is a goo time for you to get into this field because it will take you approx 5-7 years worth of good exp before you can go to work for a major airline. So you will be in good shape by mid twenties. Also first go to colloge and get your 4 year degree which is almost mandatory anymore.
Well thats a start to your question my friend.
I am currently on the A320 but also flew the 747 for 12 years and DC-9 and 727.
If there is anything specific you need answered please email me.
Take Care,
Brian