There are some very useful textbooks on Australian legal research. A selection of these are listed below. To find more books on this subject click on this link Legal Research - Australia.
Also of use are the following internet guides to the Australian legal system:
A guide to online research resources for the Australian federal legal system with some reference to the state Level, Petal Kinder, December 2014
Researching Australian law, Nicholas Pengelley & Sue Milne, 2014