Meeting with the English department

So, meeting with the English department (I turned up on the right day this time). Mostly they talk in Thai to one another. But I gather that I'm going to be teaching all levels of class, from Matayum 2 to 6 (that's age 13-18 I think). That means a lot of lesson planning. I hope I don't have to work too hard - I haven't had much practice at that. Also just remembered that kids scare me. In what world did I think this was going to be a good idea?