The main thing after your arrival will be to find a place to sleep. Unless you can stay at a friend's place or have already found a place to stay for longer, you should book accommodation for the first few days ahead. Depending on your needs and budget, that can be a cabin on a campground, a good Backpacker or a nice room or apartment. This should be your base from where to find your home, organize a car, buy an Australian SIM Card and all the other things which will help you for daily life.
We have compiled information about things to do first. Going through these topics shows you what might keep you busy in the first days and weeks.