The first thing to do is to look at the reqirements for postgraduate study at UNSW.
Prospective students should also visit the Graduate Research School's website, as it contains considerable information to be digested:
a) UNSW Graduate Research School website
http://www.grs.unsw.edu.au/homepage.html
For formal University application instructions and submission deadlines, please visit
http://www.grs.unsw.edu.au/futurestudents/apply.html