Consider the information and it's flow from the point of view of your audience who has never seen this information before. This is essential for good design. Remember, you have spent many hours working with this information. What is obvious and clear to you may not be to someone seeing the information for the first time. Knowing that we retain only a part of what we focus on.
Good presentations support and reinforce what the speaker is saying.
They do not repeat it. The information on slides should be main points which bring the audience members back on track when they are jolted awake or come into focus. We tend to look at a screen as a single graphic object, not as individual words as we do on paper. Because of this, it is essential that you keep both menu slides and supporting slides simple in design and easy to read from a distance. Keep the main point and the supporting points short and few.