I found a fantastic poster outlining chicken breeds found in Australia on the Poultry Hub website.  This shows an image of the male and female, outlines their key characteristics of the breed.   This allowed me to immediately narrow down to a few breeds to investigate in more detail.  I like the look of the Sussex chickens, and also the Australorop, and I know from speaking to many people that the Isa Browns lay the most eggs.  So this poster took me from knowing nothing at all, to a point where I could actually begin researching chicken breeders in my local area within half an hour.  Brilliant!