you should download the application form from
www.marketing.unsw.edu.au and send it back to uni attached with ur resume by a certain date... the website should specify this.
Later on, they would notify you whether you have made it to the interview stage.
the questions they ask u in the interview are really general, like
-why do you want to do this course? (may sound like a simple question, but it's surprising how many people cannot find an answer)
-where do you see yourself in 5 yrs time?
-what do u expect to gain from this course?
-what skills do u have?
-have you got any questions? (very important to ask questions!)
etc etc....
it's a really short interview...approx 5-10 mins and most ppl who attend it pass the interview. i remember about 60% of the applicants passed the interview last year. so after that, it all depends on your uai. they choose the top 45 students uai-wise...if they haven't changed anything for this year.
uai required is usually somewhere in the high 80s to low 90s
good luck!