Reading trade journals is an excellent start. Also, try to find people in your field and talk to them.
You have to remember, though, that most college grads are in the same boat as you. College is a fantasy land where the university thinks it's teaching you about the real world, but I'll tell you from first-hand experience that you don't really start learning until you've landed your first job. So don't feel too far behind the curve. Doing an internship is a huge step in the right direction. Hopefully you will be able to pull some meaningful work experience from it.
Good luck!
