Buy the casebooks, those will be used. Any other book, wait until class starts.
I already got a reading assignment but its only from ONE book. Therefore, I don't know if I should hold off on buying the other 9 books
if you ultimately decide to purchase your books at the bookstore, make sure you get there as soon as possible. your bookstore will likely has used copies of your required texts and those can save you a lot of money. since everybody wants them you'll have to get there fast before they're all sold out!
I canít believe that you already got your assigned classes and homework. Do most school have already started providing this information? My school must be extra slow.