As an Aussie and a surfer my best tip to you would be to swim between the red and yellow flags when you go down the beach, to many times i have have seen, and had to myself pull out European/Asian tourist from a rip because they underestimated the coastal rips.
Also the number for Police, Ambulance and Fire brigade is '000'
On a less serious note have fun, drink lots of beer, never take any of us seriously and travel lots and if you head up to Newcastle give me a pm for some local attractions or a guided tour. =)
Remember: In Australia if your in doubt as to whether something is deadly - always assume that it is.
Have fun.
Just to back up on Spartans tips, you really need to watch out for drop bears, they are sneaky little buggers and hurt like fuck when they get ya.