Plan appropriately.
Practice.
Engage with your audience.
Pay attention to body language.
Prepare yourself mentally.
Dummie runs on video.

Make an outline of the key messages.
Practice the script.
How to involve the audience with your talk.
Understand the alignment of your body language with the script/words you are using.
With all the preparation complete, prepare your nerves.
Make a recording of yourself on video and keep watching until you have created the video to be proud of.