If you want to get your audience’s attention learn to Headline.
It’s no different from the way an Editor approaches their newspaper.
Every article demands a headline that will grab attention but at the same time says something about what is to follow in the article.
So employ the same tactic when you speak.
What can you say to headline what you are about to talk about?
Not only will it help you grab your audience’s attention but you’ll also ensure that they can anticipate where you’re leading them.