The skill descriptions in the manual / in the game are lacking vital information, they don't tell me what exactly each level does. So i'm looking for the formulas, e.g at disciple sturdiness, you get x per y bonus hitpoints, at disciple, you get k additional stamina per l constitution - or how much damage magical attack does at which level etc.

Right now, l don't know how attributes affect skills (besides as the prerequisites for disciple/journeyman/master) and how higher skill levels and mastery thresholds (exactly) affect the skills, which is really really annoying to me :(

I have the same problem. And I've noticed that once you hit this first mastery threshhold, skills seem to take 2 points to level up instead of 1, which is really painful...

Yeah, the translation is laughable at times. It's been translated from Czech.

Later on they will take three to level up. But yeah, they don't exactly tell you any formulas all the time which can be annoying, although many times I find that this is the case in games. I've seen a few threads here on the forums with some more detail into how the skills work and what not so try and browse the forums a bit or wait and see if you get any expert help in this thread. Good luck!