Check previous posts!
Hey Alex,
There is many previous forums with the informations you need deeply explained (sometimes too much!), just click on search, go in the fridge, bring back a few six packs of Beer, and be ready to spend a few nights reading about the Salary and conditions of RSA contract companies...
By the way, if you have two kids, and a Wife that you probably Love, Contract flying and Family Life is not too too easy to manage!
Thinks carefully before to sign!
Good Luck!