if you have any tree farms or spray runoff from near by land dont bother. seems they get up and walk. heard some of the farmers down here even went as far as going to court to prevent tree farms near their dams.
they are very picky with their water quality and are slow growing. being in a hotter area, if you are after a personal food source and its allowed in your area the yabbie is a faster grower and will tolerate some crappier conditions.
do you have a source of water such as a dam or were you looking at tanks? they will require hides and to get the best growing conditions seperating the sexes is also recommended.
if you are putting a dam in let me know as i have did a diploma in aquaculture down south about 10yrs ago and saw some good ones and some that didnt work too well.
there was a marron/yabbie co-op around the pemberton area, not sure if they are still operating but getting in touch with them might be a goer and if you buy some marron out of season get a notice from the seller so fisheries dont think you have dodgied them.