I would encourage you to get a simple card: name, cell, e-mail address. If that leaves a lot of blank space, that's okay so long as the card is neat and readable. (Designers would call this "elegance".)
Do not do anything cutesy or "funky" to your business cards: no clip art, no kooky slogans, no weird fonts, etc.
As to job title, I would encourage you to run off 100 cards without a job title and see how you use them.
If you're mostly using them to network/distribute at conferences/introduce yourself to potential employers/etc., then add "Stage Manager" or "Stage Management" to your card. You might also want to add a link to your website, and maybe a small headshot.
If you're mostly using them to distribute to cast members, directors, house techs and others who need your contact information, then leave the title off, since that gives you a little more flexbility with the cards. (So when you're working as a PSM or an ASM or a costume witch or Assistant to the Director or whatever else, you aren't passing out cards which identify you as doing someone else's job.)
In all cases, avoid anything which sounds like "student". (So "apprentice", "aspiring", "junior", etc. are also off the table.)
Two last bits of advice:
- Check with your university (if you're in a university program). Many of them will offer discounted printing rates for students. If the university doesn't, your student union might.
- Do not print them yourself. The difference in cost between a "make-them-at-home" kit and a professional print run is smaller than you'd think, and the difference in quality is considerable.
