Internal job searches are not very different from external searches. To be a successful applicant for any job you must present yourself in the best possible light. In essence you are "marketing" yourself as the right candidate for the position.
Resumes and cover letters tell a potential employer a great deal about you. A well-written resume can help you make the right first impression and land you an interview. Including a cover letter gives you an extra opportunity to promote your candidacy.
An interview is a mutual exchange of information between you and a potential employer. The interview is your opportunity to shine and to demonstrate to the interviewer that you are the best applicant for the position because you have something special to contribute.
Every day you go to work, you contribute to your professional reputation. A potential employer will look at your current work habits carefully. He or she may examine the quality and quantity of your work, attendance and punctuality, and your professional relationships with supervisors and co-workers. Use each day at work as an opportunity to develop a positive professional profile.