Sure I can teach English!

As you know, I usually have two or three different jobs at a time. What can I say I have a problem and it has transcended over to Japan. Anyway, I just got a job teaching conversational English. It looks I will have my first students on Sunday. It is a mother and daughter. So I have no idea what I am doing, but the fact that I speak English is enough. I wonder if I can teach them how to say and the meaning of douche bag at the first lesson :)