Below are some links to websites that you may find useful.
Information on importing a car or motorcycle into Australia
Department of Infrastructure (Vehicle Imports)
Information on Australian customs
Information on imports from the Department of Agriculture
Department of Agriculture (Import Information)
Information on exports from the Department of Agriculture
Department of Agriculture (Export Information)
Interested in travelling the world on your motorcycle?
Horizons Unlimited Forum - A go to destination for all people interested in travelling with their motorcycle, including information on transporting your bike.