Whitelilly don't worry. The Sydney base is operational but having all brand new crew onboard is not allowed by CASA. So to get the new crew upto speed Tiger are sending Sydney crew to Melbourne to operate on flights with experienced crew. Once you have flown a few sectors you will then operate out of your home base ie. SYD.
In a few months there should be enough experienced crew in SYD and flying temporarily out of MEL won't be needed.
Good luck.