Know your students
When preparing for a class, first know what the objectives are. An instructor must have great knowledge of the material to teacher the students. Plan a lesson plan that will cover all the objectives. On the first day of class introduce yourself and explain to the students what your interest are and experience in the field or subject being taught. Take assessment on what the student already know about the subject being taught. You could do this buy testing, asking what classes the students has taken in the past and quizzes.