There are options from Reno Airport:http://www.burningman.com/preparation/t ... port.html#
Or you can fly into SF, shop and go with the Green Tortoise Hostel (google).
Or you can fly into Reno and pick up a rental (make that reservation sooner rather than later) shop and pick up a pre-arranged rideshare from the Burning Man Rideshare board (open later) to split costs.
As Fishy says, there are many, many Australians in the "Introduce Yourself" forum. Look around and send a few PMs. Join your regional group:http://regionals.burningman.com/au_index.html
Or you could join a camp and (possibly) network with other camp members to meet in Reno. See our 2013 Theme Camps
forum now, and in the next few months.
Lots of options. What you choose depends on your budget and your nature. Welcome to the board!