My school doesn't teach things like CPR and suturing during basic sciences. Should I take a 4 hour course on CPR before I start rotations or will I learn this stuff in 3rd yr?
Your school should be doing it, especially before 3rd year.
With that said, if you're the one running the code, then an acute state of badness has already set in, given that the usual outcome of CPR even among really well trained critical care people is pretty poor
If all else fails, find a willing professor to teach you things like suturing. I learned how to suture and lots more from a retired surgeon who taught in the anatomy lab.