They're going to be interested in your ideas/personality as well as your presentation so try to have some answers ready for the common questions
What can you bring to the role?
What are your faults (try and think of something that can be a positive ie a perfectionist, too freindly, a bit of a workaholic and do not mention non-punctuality or disorganisation)?
Where do you see yourself in 5/10 years time?
Why do you want this job (don't make the answer about you - make it about your golas, career/the job)?
What do you know about the company (you can bone up on the website)?
Give us an example of a time you have demonstarted leadership/management skills?
Give us an example of a time you have coped with a difficult situation at work?
How would you cope with an angry customer?
etc.

If you think about all the questions you remember from other job interviews and have an answer ready you will be more confident and relaxed which wil help you in the interview.
Don't be afraid to say "can I have a moment to think about this" if you're stumped.