Copies of your resume. Be sure it represents your knowledge, skills, and abilities effectively. A smile, a strong handshake, and a positive attitude.
First impressions are important.
Approach an employer, smile, and offer your hand when you introduce yourself. I'm very interested in a marketing career. As you can see on my resume, I just completed an internship in the Marketing Division of the ABC Company in Portland. I've also taken some courses in business marketing. I'm very interested in talking with you about marketing opportunities with your organization.