there is a couple of things you have to do
number 1 get your full unipass, the one you used to access admin services is just a temp, you need to go to the disconnect office (back of library) or e-spot (red building) and get your full uni pass which comes on a slip of paper that looks like a docket, with the unipass you can then access your unimail account. Now this is important, on that docket there is a website, go to that website, follow the links until you have read and accepted the uni's conditions of use. You only have to do this once, if you dont do it, even with the full unipass you will not be able to access your account.
at the e-spot you also need to get your student id, you can get it on the spot, along with your travel concession (same card), you have to bring photo id with you (passport, drivers licence)
remember whenever you ask a question be prepared to quote your student id number
also dont bother picking up a diary, they wont be ready yet till o- week, however as there are long queues you should get your id b4 o week, (i got mine today)
about unimail, you have to email (from your account, such as hotmail or yahoo or whateva) your student id, course code etc to whateva address you were told to email, after doing that, and obtaining your full unipass, and agreeing to the conditions you will then be able to open your account
im not certain about your course but for me, all my tutes are allocated during the 1st lecture, im guessing its the same. So remember to turn up, or you may be stuck with the 9am start!
Its probably wise to check the faculty timetable, so you have some idea which tutes you wanna go to so you will choose the right ones.