I think they all have real lives and real work, and we don't want to drop them down in pay. The usual advice is to really want to do it, and to do it your way. As far as the stage, let it rip. Speak your mind and heart. You'll be scared and nervous, but that's normal.
People respond more to honest expression than theatrics.
Boy, that's such a wide range. I'd teach the early history of recorded music, which was truncated by the musical prejudices of Edison, who controlled it. I'd also teach every regional style. Appalachian music from the 20s, Jazz from the 50s, folk Canadian, all of that. You're very funny offstage and between songs.