Aristotle wrote that there were three parts to public speaking: ethos, pathos and logos. You need to think about your own values (why are you standing there) and the values of your audience (why should they listen) before getting hung up on the argument or message. If you don’t work out the first two, you’re wasting time on the third because nobody will be listening.
You need: 20 mins, paper and pen
Credit: Aristotle, The Art of Rhetoric