Updated for the new Part 61 regulations introduced in September 2014 – low level aerobatic endorsements replace the old low level aerobatic approvals.
Training is provided in the following flight activity endorsements:
- Aerobatics (1500) – above 1,500 ft AGL
- Aerobatics (1000) – above 1,000 ft AGL
- Aerobatics (500) – above 500 ft AGL
CAAP 155_1, Aerobatics, used to be a good place to start reading however it now has significantly less than the minimum that you must know as well as some misleading and out of date information. Additional elements have been added to the underpinning knowledge requirements with Part 61. It has potentially dangerous, inadequate information about Manoeuvring Speed. Expect this CAAP to be replaced by an Advisory Circular sometime.
My syllabus for low level aerobatic training and the endorsement is OzaerosAerobatics1500Syllabus220220
Everything you need to know for the 1500 ft aerobatic endorsement is in my e-book at Amazon and the paperback version is available at Amazon or Skylines at Moorabbin Airport. 
Additional essential material to read:
Flying the Classic Loop – 07aug_stowell
A good magazine article about developing a Free Sequence – Developing The Freestyle then take a look at a sample Sportsman Free – Australia David Pilkington Sportsman 15A forms
This Kiwi Flyer Magazine has an excellent article on how to use OpenAero to design a free sequence.
KiwiFlyer-Issue-60-Aerobatic-Sequence-Design-Part-2
A more recent article by Steve Johnson on designing a Sportsman or Intermediate Free sequence in the August 2009 issue of Sport Aerobatics magazine then David’s sample Sportsman Free 2021 DJP 1A
Use this free online tool to develop your own sequence: OpenAero
G Forces – gforce
Advanced Spins – Goulian Advanced Spinning
Spins – Normal Upright Spins
ATSB Report – Possibility of G-LOC
Dudley Henriques Article_pp46-47_WAN-S-O-2015-Final combined
ICAS Documents and Civil Air Displays – information for airshow pilots.
Finally, notes on peer reviews per CAAP 155-1: AerobaticPeerReviewNotes – thoroughly recommended for all competition and display pilots.