Hi. Im a senior RN student. Having had a yr experience already, I'm gonna list the basic vital necessities that all nursing students should buy if the school has not already provided for....
-stethoscope
-watch with a second hand and military time
-pen light, hemostat, scissors, tape
-BP cuff
-drug book
-comfortable shoes for clinical
-uniform/scrubs w/ multiple pockets
-hand sanitizer
-lots of pens and highlighters
there you go

Of course there are many other things that you can buy to suit your own needs, but those are the vitals. Have fun!