I did go to the open mic night at the club I mentioned (Governor’s) last night, so I thought I’d answer these questions from experience this time. 
I spent about a week or a week and a half mulling over the topic I’d chosen, mostly just in my head. Even when I acted, I never rehearsed out loud, it made me too self-conscious. I did use a few bits on friends to test them out. I typed out my routine on Tuesday afternoon, when I had about 24 hours 'til showtime. From there, I spent a lot of time going over it from memory, making sure it flowed, came in under my time limit (seven minutes), and trying to punch it up, since I felt I had a coherent topic but wasn’t sure I had enough good jokes. I didn’t get to review it very much yesterday because of work, but I made my final changes while driving around about two hours before I went on.
Yeah, I was really nervous. Coming up with the stuff wasn’t hard, but facing the reality of performing and not being sure if it was funny was nerve-wracking. My nerves went away when we got to the club, and only returned as I was going onstage. Very convenient. So I stammered a little and my transitions weren’t always smooth, but it went really well. One of the old pros was convinced I’d been doing standup for a while. What did I think about while doing it? In order, it went something like “WOW, these lights are bright!” “That one guy isn’t laughing.” “That guy’s digging it.” “Shit, what was I going to say next?” [I felt two or three times like I’d forgotten the whole thing.] After I got two or three jokes in, I wasn’t worried about being funny anymore, I just hoped it would keep moving.
So I’m definitely going to do this on a monthly basis, and maybe I’ll get myself into their comedy class. It’s supposed to be a good one.
As far as telling people… if it was up to me, I wouldn’t have told anyone until after I’d done it. If I’d gotten a good response, I’d have invited friends the next time. But Governor’s requires you to bring six paying customers if you want to perform, so I couldn’t do that. My friends were very kind, so I told them to come anytime I do this. I told my family what I’d done when I got home that night, and I told my co-workers this afternoon. (Forcing myself into a command office performance.) It actually went better onstage last night, but they laughed pretty hard and I told them they’re welcome to come any time. Most of them would walk on hot coals for booze anyway, so I figured I could count on them.
