What you need:
Presentations are commonly done using a sequence of "slides" using applications such as PowerPoint or Keynote or Google Presentation. Presentation applications support the inclusion of images, audio or video files.
How to do it
For information on how to use presentation applications, see: PowerPoint or Keynote
If you plan to use a PowerPoint presentation on both Macs and PCs, be sure you are aware of the differences between versions of Powerpoint, particularly in how they handle audio and video, see:
Tips and suggestions
Here's a number of sites on best practices: