Interviews are two way meetings. Not only are they an opportunity for the interviewer to find out about you and if you are a suitable candidate for the position but they are also an opportunity for you to find out about the organisation and if the position will provide you with the challenge and job satisfaction you are looking for.
Think about your skills, qualifications and experience and ensure that you can talk confidently about what is written on your CV. Particularly ensure that you can talk about those skills that are relevant and valuable to the position you are going for.
Prepare some questions to ask at the interview. At the first interview it would be wise to restrict your questions to the details of the job and the organisation. Salary and benefit discussions are best left until a second interview or a job offer is made.