Instructor Rating
You will find the details in CAO 40.1.7 (50 hours total) and there are very little changes to the instructor rating coming in December.
I couldn't recommend Curtis Aviation at Camden highly enough. I don't work there but have a lot of dealings with them on a daily basis. They do a fair bit of instructor training and can even do the test if CASA doesn't want to do it.
My next choice would be Pacific Flight Services at Bankstown.
Hope this helps, I know choosing the wrong school for this rating turns into a nightmare.