Definitely get a teacher! Some colleges may give free lessons through their music department (Baurch College in NYC does, I'm sure they're not the only ones), so check at your school. Guitar is pretty simple to get good at, but difficult to get great at. Violin is difficult to get good at, so you really do want that teacher and guidance. I don't see a problem actually getting a teacher first, even before getting a violin, and then relying on your teacher's insight into beginner instruments so you don't make a costly mistake buying your first violin either.
You could also check Google Groups, read up in some of the violin family related groups like "rec.music.makers.bowed-strings" or "rec.music.classical.performing" or something to see if anyone answers your questions, or raises good points you haven't thought of yet. It should be a decent time killer at any rate
jim