I teach psychology; it really depends on what you are teaching and to whom.
A basic intro guideline:
* Introduce who you are briefly
*What the course title is?
*What will students learn?
*Who is this course for? (beginners? Professionals? those working with teenagers?)
Example: "Hi, I am Alicia Paz. I am a Therapist with a Masters's Degree in Counseling Psychology. I have been teaching online for the last 8 years. In this course (course title), students will learn how to XYZ, the terminology regarding ABC, how to utilize XYZ in working with adults with depression. This course is 6 hours long, has 55 videos, and is focused on learning (course topic.) I am available to answer questions and help guide you through (course topic) as you learn. I hope you get the most out of this course, and I look forward to seeing you in class."