shoulder mount, slider, dolly, jib arm, ball head, diffusion, sharp prime lenses, batteries on batteries, follow focus, i can go on...
but really you don't need to own any of this, you can rent great stuff reasonably at most rental houses, or even better, friends, photographers, actors, crewmembers might have stuff or hookups that they can lend to a production.
first, get yourself a story that you're sure is strong, the pieces will fall into place from there.
school will also help you BIG TIME, spend your money here first. they lend gear for free, they have editing suites, studios, you will meet photographers, audiophiles, good and shitty and enthusiastic actors, not to mention teach and inspire and prompt projects. a deadline was always my best friend. if you need to, at this point, buy, rent, or DIY whatever else you need.