There are many elements that go into making a great lecture, but the most important one is to lose the notes. If you are giving lectures in a course at any level, the worst practice you can engage in is to rely on notes. This behavior is problematic for several reasons. You will not properly know the material, necessitating frequent glances at your notes. The students will notice this and consider you to be unengaged and not knowledgeable. Requiring notes will more or less tie you to the lectern, or to some kind of platform at the front of the room. If you carry the notes around the room as you talk you will be perceived as confused and not authoritative with respect to the subject. Get rid of the notes.