Tayside aviation have a great guide on becoming an airline pilot, it's available
here
I've always said for a long time that if I was ever an airline pilot you wouldn't catch me with Ryanair, but it seems that those that are flying for Ryanair seem to love it but those that don't fly for them hate them.
I fly with a Training Captain from Ryanair and he's a cracking bloke, I know a lot of FOs there as well and they all seem to have no problems, in fact one of them left the AAC to go fly with them.
Keep an open mind, but keep yourself safe there is no point gambling your life over a career.