I bought a logitech wheel (not g25). it cost somewhere around 50€. Now i´d like to know the settings i put to LFS.

That all depends on what wheel it is.

Whats the full rotation of the wheel, does it have force feedback, how many buttons does it have, does it have pedals?

I´ts logitech formula. it turns just over 90 degrees. With set i mean in the controller options the 2 adjustments in the top. It feels ogg when when u turn a little it turns as much in the game, but then u hav to turn carefully it bacuse after about 30 degrees it starts to rotate the wheel in the game vary fast.
Shortly: My wheel turns only 90 degrees but the car turns much more in the game.

Just try setting it to 90 or 180 degrees in game and set the wheel turn compensation to 1.00. You just have to find what you like best.

Because the wheel doesn't have much rotation when you turn, it will match for a bit but then it will turn alot more ingame, nothing you can do about that....except buying a DFP or G25, they have the extra rotation.