Create a good listening environment. Speak clearly, loudly, and at a proper pace. Make eye contact with everyone in the room at least once during the lecture. A simple pause to think is far more effective than rambling. Be enthusiastic about your subject.
Nothing ruins a good lecture more than a lack of enthusiasm on the part of the lecturer.
Use examples, stories, and anecdotes. These can serve to illustrate certain points effectively and add color to your lecture. They are excellent attention-getters, and audiences tend to remember them long after they forget the rest of a presentation. If you use slides, overhead projections, or other visual aids, be sure that you can operate the equipment and that it works properly. Visual aids should fit smoothly into the lecture presentation.