The final step is to enrol in you courses.
At UNSW, you manage your enrolment online, via myUNSW. You can complete your enrolment at the same time you accept your offer OR you can log on again later and complete your enrolment up until the start of semester.
Remember: you only need to enrol in classes for one Semester at a time. A full-time study load is 24 UoC, and the minimum enrolment is in 6 UoC.
The best advice we can offer is to make sure you reviewed the pages in this Enrolment Guide so that you know which courses you would like to take (and what time they are offered) before you enrol via myUNSW.
The Faculty of Science is also hosting an Enrolment Advising Day on 22 January 2013 if you require more in-person assistance.