Once you're done with the first game, I highly recommend playing
the remake of 2 instead of the original. The remake is excellent.
Any tips for a newbie thief character? actually has some good stuff in it for everyone, though thieves are of course the focus of that thread.
(Minor Spoiler Alert) Helpful Advice has some pretty big spoilers at this point, IMO, but if you don't mind there's certainly some good advice there.
hercufles: I noticed in battle stam is my wordt enemy that i easely die of tirement. And I noticed that some areas you need to climb does thast mean im useless as a fighter or is it possible to lvl up your climbing?
Yeah, Stamina is a huge limiting factor starting out. Make sure to work at the stables every day to get some free stat increases without having to face combat (and getting some silvers too as a plus). And when in doubt about your ability to win a combat, run away.
Every class starts with the skills they need to win the game. (To get all 500 puzzle points, even.) You don't need any other skills, there's always at least one solution with the ones you have.
That said, climbing can indeed be useful in some instances if you choose to take it, and would probably be my suggestion if you want to add any additional skills to a Fighter. You can only level it up if you assigned some points to it when you started. Skills at 0 never increase.