Usually you are asked to start the interview by introducing yourself (be brief); next you tell the employer why you have applied for the job and what you know about the company. Be relaxed but attentive.
Common questions include: Do you find it easy to learn new things? How do you react to criticism? Are you a problem-solver? How do you tackle a problem? What are you proud of? Can you tell me something really good that you have done? What do you expect to be doing in 5 years' time? What do you think a good colleague should be like? Describe a situation where you made a mistake and what you learnt from it. How would your friends describe you? How would your manager describe you? How do you function in a group? What are your strong and weak points? How do you handle stressful situations? Why should we employ you?
During the first interview you can ask what an ordinary working day is like, when you will hear the result of the interview, when the job starts, if there is an introductory programme, etc. Do not talk about pay at the beginning of the application procedure. Wait until the employer raises the subject.