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You presentation must be simple. It is difficult to deliver complex ideas in a speech. Remember to KISS. However the information you present must be concrete. Don't have a lot of intangible theory in there.
It helps if you through in a few unexpected items. This will help keep the audience engaged and guessing. Another technique to keep interest high is to be emotional.
You need to be able to come across as credible. There is so much information out there from many sources. People do not trust what they hear in general. Finally, the best speeches tell a great story. Do so, and you will be on the road to success.