Do you have any idea about what type of interview he needs to learn English for? Is it a job interview? What kind of job is it?
I really have no idea what it means to want to learn English for an interview, but if you know the answers to the questions above, you could then have an idea about what type of vocabulary and expressions to teach.
On the other hand, as you say that your student is a beginner, here are some free lesson plans with a variety of activities for beginners that could help.