nah don't take it to a mechanic for those problems. it is a waste of money.
it is good to learn how to do things yourself. You have to start somewhere.
As stated above: Buy a gregories service manual. These help a LOT.
1) the noise when turning the wheel will be a power steering problem. check fluid, check for leaks.
if neither of these go to:
r31skylineclub.com and ask or search there. (Great site for R31's)
2) Make sure the hose at the botton hasn't come off hence the leak.
Yes most wreackers will have these.
What state r u in? if melb can recommend some good wreckers.
3) You get to the bulb from behind. Inside the engine bay you will see black rubber covers attached to the back of the light. pull this out then unscrew bulb and take to auto shop.
any more problems just post them up, always happy to help