Pellit, being a demo racer and using keyboard i strongly advice you to forget the keyboard.
It seems really easy to control, but wait till you starting seeking for fast times, it will become painfull ant stressfull.
Devote (lol) the most possible of time in LFS racing with with the mouse.
And when you buy LFS (oh yes, you will feel the urge to do this), the best choice will be the wheel, till then i think you really don't need the wheel.
PS: I did 1.32.44 a few days ago in BLGP using the XFG, but i took ages, and now this time is easly beaten by mouse, wheel players with a few weeks of gaming.
cya