thanks for the replies guys!.. i wasnt aware that you can have multiple Business names under the one ABN.
Im currently looking at a few sheds that are up for lease atm, might go have a few inspections and go from there! It will only be an after hours and weekend workshop for the start, just till it gets off its feet. Im actually quite excited about doing it!

I also think Riverina Performance Centre sounds the best.. as long as its clearly noted that i do all types of general repairs etc it should be fine.. im in talks with my graphic designer mate, who is designing some flyer/poster designs for me to look at.. we have a RAAF and army base in town so there wont be any shortage of work, the performance car scene is also quite strong.

EDIT- I will also look into producing Performance datsun parts too at a later stage! will also look at setting up an online shop later