DMs, GMs, Storytellers, Narrators, Maim Masters, and others!

What was your very first campaign/chronicle/story/whatever like? The very first time you sat down behind a screen and tried to run something. Did you plot it out, or did you play fast and loose? Was it in an established setting or your own? Did you have ANY idea what you were doing? Did the campaign end or just sort of peter out? And do you think you did a good job?