I think you have gotten some great advice already.
Once you figure out what you are interested in, set up informational interviews with people in the field to learn more. These are similar job interviews. It is your time to share your story and learn about the profession. Unlike job interviews, you should not expect a specific outcome but some people have gotten jobs or referrals through these types of discussions. Your career service office should be able to put you in touch with alumni in your area of interest.
Take advantage of any career fairs and company information sessions on campus. These companies are looking for people like you who are the start of their career and the company often have well established development opportunities.