Hiya, a good idea is to look into the current issues in nursing (nursing journals are good for current issues), try to think about times where you have work well as a team, your strengths and weaknesses etc how you can relate the experiences you have to the course. For example i worked in customer services in retail so i spoke about how i was very familiar with talking to the public and how this could be transferred to nursing.
When i went for interviews a while back they generally asked scenario based questions to see how you would respond to particular issues. some unis do group interviews where you discuss a scenario as a group and all have to take in what other people are saying but also get your own point across without being pushy.
Good Luck !!