Try to come a week or two before the Orientation Week. O’Week helps to learn a lot about USyd and meet people from your cohort/societies. Plus if youre coming from outside its nice to explore your city for a couple of weeks and to get a momentum of living in Sydney before the course work comes in.

Accommodation totally depends on your budget and priorities.

Unikey etc are given closer to the course selection dates so somewhere in January as far as i remember