Don't bore them by repeating what they already know. What can you add to their knowledge Find out as much as you can about the audience before speaking. Gather verbal and visual materials Verbal materials include examples, statistics, and testimonies. Practice using visuals Be sure you can see from back of the room. Slides or PowerPoint work best for large audience.
Handouts are good, can be expensive.
Don't bring the visual out until you are ready to use it. Put in blank slides if needed - this keep's audience's attention on you. Do not pass models around during presentation - takes attention off what you are saying. Need Step - convince audience why they need what you are going to share. Conclusion - a summary of the main points you want audience to remember and what you hope listeners will retain even if they forget everything else.