ok when you enrol you'll get your unikey login
you won't get your actual timetable until o-week, but you can go to
http://web.timetable.auth.usyd.edu.au/index.jsp, and click on "Find the Timetable for a Particular Unit of Study" and log in
enter the unit codes of what you're enrolled in and that'll tell you the lecture times.. and possible tutorial times
if your unit has streams then you'll be placed into a stream. for example if you're in stream 1 then your lecture times will be those specified, and then you find the tutorial number that starts with the 1.xx
keep in mind that you're not guaranteed to get the timetable you worked out due to full classes etc. but if you go to the timetable people at o-week early, you'll have a better chance of getting the timetable you want