Welcome to Oz Dryseals, you'll really love living in Victoria.
We have pretty much anytype of terrain you want to drive in, from snow to mud, the high country, to the rain forests of the otway ranges. It's all on your doorstep.
Prices on a lot of aftermarket Jeep stuf here can be a bit expensive, so if you know what vehicle you're after, (Grand Cherokee, Cherokee, Wrangler etc), it might pay to purchase the large heavy stuff over there and throw it in your container to be shipped over, you will save a heap in doing that.
Then all you have to do is find the Jeep you're after and that won't be too difficult.
Also have a look at
www.mjoc.org.au that's the Melbourne Jeep Owners Club with around 300 members running around 110-120 trips each year. Everything from winery tours to extreme off roading and everything in between.
Cheers and welcome aboard.