Written materials are frequently your first contact with an employer. Make sure they communicate your interest and qualifications effectively. Use a brief resume, especially for career-related positions, to present yourself and your background. It's an organized and professional way to present yourself to an employer. Application forms are important.
Personal presentation is also extremely important.
The more professional the position, the more professionally you should dress. When speaking with employers, be personable and show interest. Think about the job requirements and point out your qualifications that will make you successful on the job, whether or not you have direct experience. Read the Summer Employment index. Most suitable for business, engineering and computer science jobs.