On Australian currency who are the people on the coins and what are they famous for?

Answer 1

The only person that appears on most Australian coins is Queen Elizabeth II. The only exception would be the aboriginal man on the $2 coin.
If you meant banknotes, here is a link to the Central Bank of Australia web site that has all the info you need:
http://www.rba.gov.au/CurrencyNotes/NotesInCirculation/index.html