Hi estate and welcome to the forum. There are many of value. Best place to start would be to get a copy of Greg McDonalds Australian Coins and Banknotes. This will be invaluable to your collecting.
As a rough guide, any King George V predecimals in high grades are going to be worth a bit, and sometimes quite a big bit.
Then you have the stand outs, 1930 penny, 1923 1/2 penny to name two of the more well known ones.
Sorry, am a bit short on time, but I am sure someone else will give more detail. A lot of friendly people here.
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