Australian Car Repair Issues? Ask an Auto Mechanic for Answers ASAP
1997, so VS Calais.
Sounds like you have two troubles there, the steering needs to be looked at for worn joints that upset the alignment figures and make it steer vaguely in a straight line, pull one or the other, not self centre correctly etc.
Your other problem sounds like the ignition switch and/or a sticky ignition barrel, the key should release from the crank position to the run position by itself, if you let go of the key. What does it do if you bring the key back manually as you start it?
Have you tried as suggested above?