Save everything you do. Keep a journal of all the work you do. You'll forget it, and it can be very useful for next position. Weekly papers let you write longer pieces. It's possible to find paid internships.
People are really impressed with a professional-looking portfolio.
Try to get an internship that offers the chance to learn technical skills. Some union shops won't let you, but smaller organizations might. The technical knowledge can be extremely valuable. Not to be copied or distributed without permission.