Their company appreciates and recognizes the value of mentoring. You learn a lot from osmosis and observation. Ask for direction about priorities. Gives great experience in being part of a team. Seek energetic and enthusiastic interns.
Portfolios Start with the most recent, most complex, best work, most complete project.
Some examples of your best work good too, just make sure there is one complete work. Bring FULL-SIZE boards, not photos, not reproductions reduced to 8 x 11. If you have developed skill over time, include one old and your latest work so they can see progress. Most of the interview will revolve around your portfolio presentation. But wait until you are asked to send anything.