New class

I've been given a new adult class which starts tomorrow evening. There will be three students. They want:
- to understand TV programmes such as CSI and House.
- "prepare" (I've not been told if they are sitting the exams) for TOEIC
- discussion

I usually teach children and do some informal discussion classes with adults. I have downloaded an episode of CSI to use in class.

I've had a long day and this class is a bit of a surprise. Any tips/advice would be fantastic. :)

Edit:
I'm in Taiwan.
The lesson will be 90 minutes long.