With the subject in question, you're probably better off waiting until session starts. Or, as thegovernator suggested, contacting the subject coordinator first so that you know what you're reading 'towards'.
Other than that, I think that the following are good things to know:
1. You know how in high school, essays routinely came back with marks >80% - ie. 18/20, etc? This will not happen to you in law school. Sometimes, a mark of 65 is excellent. That said, you will have a few easy courses/assignments spread throughout your degree.
2. You don't know shit. Did you do well in legal studies? You still don't. A law degree is a course of study intended to give you the skills you will need day-to-day as a legal professional. High school was day care. Don't go into the course thinking that you know more than the lecturer, or I promise that your over-confidence will crush you.
3. The UAI, and HSC marks generally, no longer mean anything to you. Don't ask what others got, and better yet, don't care. Otherwise you may find that the kid who got 87 is getting Cs and Ds, whereas your >95 arse is barely pulling Ps, making you realise just how worthless you are.
4. When you get to them, the following subjects will suck for you: Property law. It's compulsory, so suck it up and get over it. Do not, by any means, consider dropping out because of this bitch of a subject. You think I'm joking? I know of 4 people across 2 unis who did exactly this. It will try to destroy what makes you happy. Do not let it win. It is my hope that, with a bit of a heads up, you'll be expecting the pain and will somehow be able to see the dim light that shines at the end of the tunnel against a tapestry of suffocating, unending black.
5. Going to class is a good thing. Oh wow, you're no longer in high school and classes are *gasp* optional! True, but unlike high school, you're now shelling out money for these classes, and contrary to rumour, attending them actually helps you pass the course. Sure, skip a few here and there, but don't be one of those people who attends 2 out of 15 lectures and is left wondering during the exam what an easement is.
6. No one actually cares about student politics, so shut your mouth. I think this is a good thing to know generally, regardless of your course.
I hope this helps you as you embark on the wonderful, magical journey of rainbows, unicorns, and soul crushing defeat that your studies in law will take you on.