You’ve probably heard this before but it’s worth saying again: it’s very important to have some kind of work experience. You’ll find that even if a job is entry level, they are all still looking for someone with some kind of experience.
Best way to get that before you graduate is through an internship. START LOOKING NOW! Look up companies that you’re interested in or are in your field and see if there are any available. Be sure to check back often. Go to the career center on campus, they will be your best source. You can also check job search engines.
(I interned the summer before I graduated. Not only did they keep me on part time through my last year in school but they also gave me a job offer when I graduated.)
Pay attention to job descriptions that may catch your eye. This will give you insight to what skills are valuable and most often used in your field or job of interest.
Here is a great link for current U of M student to get free business cards.
There are always nice to have when you make a contact without your resume on you.