Find a story to serve as evidence for your viewpoint. If it's good, it will be the centerpiece of your talk.
Make the story come alive for your listeners
By establishing place and time.
By using action and dialogue.
By re-creating the feelings/emotions the story evoked in you.
Bore your audience with too many facts and statistics.
Let the audiovisual staff run your show. Turn the lights up as bright as you can, so that you are displayed better.
Hide behind the lectern. Get out front. Be dynamic.
Use a handheld mike or lectern mike. Unless you're Phil Donahue or the president of the United States, a hands-free, cordless lavaliere is the only way to go.