I recommend you head over to Aussievapers.com, lotsa good people there to help you out!
For the record, most of us buy liquid nicotine form overseas and use it to "juice up" local sourced e-liquids although quite a few people also buy ready to vape overseas e-liquids from local vendors and just add enough nic to it to work. It's all a bit of a pain but it's the situation we find ourselves in.
You can, of course, buy ready to vape juice from oversea that already have nicotine in them. Localvape are quite good but for other recommendations you're best ask at Aussievapers.
If you decide to buy just nicotine I can readily recommend hiliq.com.