The Australian government has provided an excellent guide to achieving passive solar heating in your home that is available online at www.yourhome.gov.au Just be aware that because they are in the southern hemisphere they orient solar exposure to the north rather than to the south, as in the northern hemisphere.
This guide covers these topics:
What is passive heating?
Why is passive heating important?
Passive heating principles
Orientation for passive heating
Thermal mass for passive heating
Windows and glazing for passive heating
Shading for passive heating
Floor planning for passive heating
Design for effective convection
Insulation for passive heating
Sealing your home for passive heating
You can read the entire tutorial at www.yourhome.gov.au