Watch this short lecture on the components of a public speaking introduction.
Source: Layne Paubel's Adobe Spark Creation
Public Speaking Introductions - Adobe Spark Presentation
This is the Adobe Spark Page that was used in the above video. You can review the information here. I also recommend that you copy and paste this link into your search engine (https://spark.adobe.com/page/nuitN9jMuJ1rC/) to go to the presentation document, print off the information, and take notes on it!