You require a (free of charge) visa for Australia if you plan to stay for less than 3 months. This can be easily organised through this government site:
short term visa
For longer stays, between 3 and 12 months, you need to obtain the ETA form:
long term visa
Are you traveling with one of our 4×4 vehicles and need a Permit to travel through Aboriginal land? Visit the very handy ‚one stop shop‘: the ExplorOz website (click).
The following link is also a ‚Must Read‘ and tells you all you should know before you venture into Australia’s many remote area’s with your rented 4wd vehicle: remoteareatravelinformation.
This Australian Government website provides handy and up to date information on traffic and road rules Downunder: http://www.ntc.gov.au/roads/rules-compliance/
It may be wise to be informed about using the toll roads around Melbourne, Sydney and Brisbane before you step on the plane heading for Australia. Toll roads in Australia are easy to use and save lots of time to travel through or around these large cities. But there are not toll booths and it is your responsibility to pay the tolls within 3 days by phone and your credit card. Failing to do so will result in hefty fines which are easy to avoid. Read more about Toll Roads: Australian Toll Roads
You probably know the Australian national carrier Qantas. To give you a bit of a taste of typical Aussie humor, you should read the following, taken from feedback-correspondence between Pilots and Technical ground staff: „Having a laugh“
Australia (7,686.849 square kilometres) compared to Europe (226 x Holland, 22 x Germany, 59 xUK, 14 x France, 186 x Switserland)
Distance Chart Australia