Most migrants to Australia initially arrange temporary accommodation before exploring the local area to decide where is best suited for them to live. Whether you want to live by the beach, or closer to the city, looking on some real-estate websites will help you figure out what's available and the cost involved:
If you're planning on renting whilst in Australia it's a good idea to bring previous rental references if you have them, this will make the process of securing your first new apartment or house much quicker and easier.
Many of the estate agents operate 'open inspections' where you can view the property at a specific time. Make sure you know when these are for each unit you are interested in as the rental market is competitive and properties tend not to be on the market for very long.
Read some useful information on renting in Australia here.