Hi there,
I think the best thing for you to do would be to trawl through this forum and go back as far as you can. You'll find literally hundreds of posts that answer your questions very well indeed!
Basically, do well in your GCSE's, go onto college and pass your A levels and most of all, be interested! You'll find the correct and upto date recruitment info on the NATS site
http://www.nats.co.uk
You could also practise your spacial awareness and reasoning techniques. You can buy books at most large bookshops - certainly online - that are filled with tests involving 3D cubes, numbering, shapes etc etc. They are most useful!
The job itself is very rewarding, definitely a challenge and ever-changing.
The pay is good compared to say an office job, we get paid well in general. It certainly isn't the type of job you can do just for the money (ROFL at that bit!!!!) though and we get paid much less than some flight crews and other connected airspace jobs.
All in all - study hard, keep in touch with what's going on in the world of aviation and air traffic and read back on these forums.
Good luck
