See Matt Beasley's post entitled, "Teaching How to Interpret in the Sermon." I often tell my students that you will do at least two things when you preach or teach. (1) You will communicate content. That is, you will have something to say. (2) You will communicate method. This is typically less direct and obvious but you will teach how one is to handle the text by how you handle it. You may do more than these two but you will not do less.