Haha that's not far, I did Melbourne to Perth back in January, and back again!
This is the route that I took. I only made one stop and that was at Bordertown, it has a nice little park with a lake and gazebo there, worth chilling for a bit to stretch your legs. Oh I also stopped at Horsham for some McDonald's haha
The car will handle the trip fine, you don't need to do anything in terms of preparation. But here are some pointers to help you out:
* Go the speed limit, do NOT speed.
* There are cops along the highway
* There are plenty of petrol stations, you don't need to worry about carrying extra fuel
* There are plenty of fast food places along the way too (well enough)
* Depending on your provider, you'll get 99% mobile phone coverage the whole way
* If you're feeling tired, take a rest stop as soon as you can. This is very important for long distance travelling
* Keep your headlights on, it helps out on those long country highways to see other motorists (though everybody in the metro areas bitch about it - but they're simply ignorant idiots haha)
* Be wary of animals, there are kangaroos and other things wandering around the highway. Most of the time they'll be active at sunrise and sunset, but in my experience I never saw a single live kangaroo, just lots of dead ones.
* Speaking of dead animals, in the drive between Melbourne to Adelaide, most of the corpses are on the Victorian side haha
* When I drove in January; SA was a quick trip, however going through Victoria was slow as shit, all of a sudden lots of road works and incredibly slow speeds!
* It took me about 9 or 10 hours, easily doable in a single day
* Also keep at least a three or four second distance behind the cars in front of you. If a car hits a kangaroo, that beast gets flung over the car and if you're close behind that front car, the animal will go right through your car too!
* Play good music throughout your trip, it'll keep you active and alert
* There are lots of historic monuments and sightseeing and tourist spots along the way, if you're bored and want to kill time feel free to check them out, but most of the time they're not that worthwhile checking out
Think that covers just about everything, most of that covers any sort of long distance trip anyway. If you have any other questions just ask away.