Welcome to the world of LFS!!
Tip number 1 - and you already know it - get a wheel
Or you could use the mouse to drive, plenty people are fast enough with the mouse, keyboard is more difficult to get fast.
Quick shortcuts:-
F12 - Tyre and on the fly setup changes
F9 - Tyre temps
F10 - Suspension damage
SHIFT+S - pit in
SHIFT+R - vote to restart
SHIFT+Q - vote to qualify
2 - save multiplayer replay
Some notes:
Joining a server and voting to restart straight away will not please most
Causing a crash at turn 1 is usually the best way to get kicked/banned
Other than that - have fun and get racing
