Welcome to the Skyline family mate..
Before you start modifing your car I strongly suggest doing some research. There are heaps of threads on here have a read and plan what you want done. Have a realistic power target (for Street, Drift, or Drags) and budget.
Theres heaps of performance shops out west to choose from, CRD, UAS, UniGroup, they all do great work. Just remember you pay for quality. Your better off folking out a bit extra and going for quality parts and workmanship. or simply risk the reliability of your car and in the long run your wallet.
Have a search around the for sales section on this forum, check out nengen, perfectrun, hp in abox, and greenline for import parts.
Just my two cents. Enjoy your new ride!
Cheers,
Johno