Sara
Have you had ANY correspondence from easyJet with regards to the interview? You are asking an awful lot of questions most of which should be covered by easyJet's correspondence to you (particularly with what to bring to the interview).
If you have had correspondence, have you read it? If you haven't had any correspondence then please get in touch with easyJet recruitment and ask them your questions as you can't just rely on information from on here when it comes to geting a job on the other side of the world from you.