[FlyingShark]

I mostly combine rudder and ailerons to turn. The rudder also helps you in aiming and in aerobatics for example a barrel roll = ailerons to one side, rudder to the other side. Trimming your plane properly makes it go faster, you may also wanna learn to get use to setting the right propellor pitch.
Now, I have to say that unless you have rotary buttons (good ones), trimming with the keyboard is a pain.
Good luck.

~S~