It's quite natural as most of us are not prolific talkers like Mark Antony. However, we can make the most of those few moments at the pulpit. All it takes is a little conditioning and some hints.
Preparation is the key The key to good presentation skills is preparation.
Organise your presentation in the context of your audience. Your preparation does not end with the text material. You need to check the presentation room for seating arrangements, proper lighting, board, chalk and other requirements. And do some advance testing with the microphone. So, now your infrastructure is fool proof.