Just getting some nostalgia/ discussion going.
What was the first module that you purchased?
B1, I think it was, In Search of the Unknown, the one that came in the c1980 Basic Set, which, I'm guessing, I'd already played in. I promptly lost it, though. I finally got a copy and ran it using 5e the Feb after that came out. I guess that's my record for greatest lag between buying & running.
What was the first module that you ran? Was it for D&D or another game system? Was it official?
"Sprechenhaltestelle." For Top Secret. From the pages of Dragon Magazine, but not technically official, I don't think. A complete trainwreck, since I ran it like a dungeon - which is the only reason I remember, with certainty, that I did run it, not just read it.
I'm not sure when I first ran a module for D&D. I'd carefully read through quite a few, bought or borrowed, and played in many (not always knowing if it was a module, made-up, or random, behind that DM screen) but I'd gotten the idea that the 'right' way to run D&D was to come up with your own stuff.