We have a wireless lapel microphone for the presenter to wear. This will allow you to walk anywhere in the room and still be heard. There are microphones on the tables in the center of the room and in the ceiling. These are turned on during the entire class so that everyone can hear student comments. Please remind your participants to be aware of this.
All graphics work better in horizontal format because a TV screen is wider than it is tall.
For text graphics, try to restrict yourself to 6-10 lines per graphic. Instead of paragraphs, use bulleted lists. Vertical slides will be cut off a little on the top and bottom. Put slides in a carousel tray just like normal. An 80-capacity tray works best.