yeah you shouldn't buy them yet, you'll get a unit outline on the first day of each subject which will tell you what you need to buy. There are lists of books on the coop website, but a lot of the time lecturers subtitute one book there for another, or add or take one off the list etc. It's better to buy books when you know what you need, so that way you don't spend money on books you don't need. As cape says you can buy your textbooks from the coop bookshop located on your campus, or alternatively you can purchase second hand books from students...look out for advertisements if that's the way you want to go, but that all depends on how much your textbooks cost. Just wait and see so that you are sure before you do anything, there is no rush you'll have plenty of time to get books when uni starts.