I'm a 1L as well, but here is what I bought based on recommendations:
For Propery, I got Gilberts Law Summary on Property. It's written by Dukeminier, who also wrote the casebook we use. Our professor seems to read right out of the thing. It breaks down the concepts pretty neatly.
For Civil Procedure, everyone recommended to me the Examples and Explanations on Civil Procedure, so that's what I got.
I didn't buy anything for Torts as of yet, since that is the one class that I've been able to easily understand so far.
For Contracts, I have no idea. Didn't buy anything since nothing really seemed to stick out.