The School of Computer Science and Engineering (CSE) provides a Mentor Program to allow you to meet both new and existing students from CSE.
You will be personally assigned a Mentor, a CSE Student who is in 2nd year or above and normally doing your course. Fun events such as BBQ's and movie nights are held almost every week throughout the semester (list of events). These events are not compulsory, although they are a great way to meet new people, have lots of fun and get free food. There are also cash prizes up for grabs for the teams that are more involved throughout the program.
*note - This program is NOT academic - the Mentors will not help you with your assignments, etc.
Other UNSW Mentoring Programs can be found at UNSW counselling service