Hi Franny and welcome to the group
You really need to start by reading the DIAC website to within an inch of its life. Please see here:
http://www.immi.gov.au/
Although the stuff is ferociously complex, the idea of using "postcards" is good because they use the same format for every visa and keep the words to a minimum.
There are also Information Forms and Booklets about almost every visa, which you can download from here:
http://www.immi.gov.au/allforms/index.htm
It is absolutely headbanging stuff, but for the most part you can get the gist (after a struggle, admittedly.)
Meanwhile, come back on here and ask as many questions as you like. You'll always find someone who can point you in the right direction and a couple of very knowledgeable Migration Agents post on here too.
In the meantime, Friday night is party time in the chatroom. There was a very lively crowd in there last Friday night and the chatroom software is easy to work once someone explains how! Go up to where it says "The Lounge" on the left and click on it. A drop-down menu will help you to move from one room to another.
Cheers
Gill