Well, I completed my Arts/Law (Hons) degree at UNE last year so I'd be happy to answer any questions you have about studying law.
Firstly, depending on what degree you choose, you may find that you don't actually start your "first year" law subjects until your second year.
Basically, regardless of what degree you choose, you'll find that your "first year" law subjects include Introduction to Legal Systems and Methods, Criminal Law and Torts. Introduction to Legal Systems and Methods is the subject most similar to Year 12 Legal Studies. In it, you will learn about the legal system, how to structure legal essays and how to undertake legal research. Criminal Law and Torts are more advanced, but the lecturers will know that most of the class have just finished high school (or are starting out in their law degree), so they are more than willing to assist students. Most people will never have studied the individual subjects before, so you will all be considered as "begineers" and the lecturers will essentially "start of from scratch" with most subjects.
Throughout your degree, you'll find that you have to undertake a number of compulsory units. These include: Contracts, Corporate Law and Jurisprudence. You'll also have the chance to study some electives. I also recommend studying for your honours degree if you have the chance.
Subjects are structured around lectures and tutorials. Lectures are the more formal part of the subject. Unlike many city unis, you can be guaranteed a seat in the class. Tutorials are where you break up into smaller groups and discuss/analyse what was said during the lectures.
Essentially, if you enjoyed Year 12 Legal Studies, you should have no problem adapting to Law School.
I believe that UNE's UAI cut-offs are low because more people don't want to go to a country/regional town. However, I can honestly say that studying at UNE was great. As the uni is small, you get to know your fellow uni students really well. Regardless of whether you stay at college (which I did for my entire degree) or in town, you'll make friends that will last a lifetime. Plus, the lecturers are always willing to have a chat with you after class to help you with any questions you have. There's heaps of activities around the place (especially sporting and cultural activities) so that'll keep you occupied outside of studying. I have heard stories from students at other unis that they often didn't have much contact with other uni students or the wider uni community. All I can say is that I did not experience that at UNE.
Feel free to ask any other questions you have. Hope this helps.