If wanted to take a trip to New York, I would not just jump in my car and drive east. There are certain requirements that would have to be meet. That's when a plan comes into play. First, I would have to ensure that the car is running according to manufacturer standards, example are the tires in inflated to the proper amount. As with everything in life you have to have a plan if you want to ensure a successful venture. Teaching is not different. If you walk into the classroom with no guide as to what you are doing then students will know that you are not a prepared person and will use this to their advantage, and that is not the purpose of them being in class. The student will in turn their attention to finding your faults, rather than focusing on the course.