Talent must be aware of their light source and camera position, framing, and movement and “hit their marks” (without the audience being aware they are hitting their marks) as directed.
Learn how to read from a teleprompter.
Depending on the form or style, learn when it is appropriate or inappropriate to look directly into the camera (at the audience).
Know what colors and patterns not to wear; tasteful and professional: equal to or respectful of your subject.
Voiceover techniques: engaging speaking
Sounds you make that will affect the mic (plosives, jewelry, etc)
If there is an audio engineer, be sensitive to his or her ears
Types of V.O.