As an Australian I can tell you that your not going to have any problems with the locals. At the age of 14 going to an Australian school you will generate a lot of interest with the girls (unless of course you look as if you have been hit by a truck) be your self listen to the locals you will be fine.
AH! Aussie girls. I loved (and still do love, don't tell my wife) the bodies, now if they just came equipped with a Kiwi accent, Irish grace, English education and Scotish constitution those women would be the most perfect ever IMHO.
Seriously, what Lyric said, in my early career I was sent to Australia and learned that if I talked a little, listened a lot & showed even moderate interest in a Aussie girl then she became very interested in me. Oh yes, enjoy the beach as much as you can; unless you get sent to Hawaii, you'll NEVER see the likes again.