My brother bought the first AD&D 1st ed. hardback. I had to have it, too.
We both had all three books.
I doodled on graph paper.
We got a group together to play.
I was so excited to roll up a character and play.
We're about to start, and my brother says, "You're the DM."
"But I've never DM'd," was my reply.
He said (and I am laughing now, remembering this), "But you're the only one who has a dungeon prepared." This was in reference to my graph paper doodlings. No theme. No planning. No coherence. Just a bunch o' rooms with random monsters in every one. I did have staircases down to the lower levels, and the monsters got tougher as the levels got deeper, so it wasn't 100% stupid. Just 99% or so.
The dungeon was bad, but we all had fun. Watching everyone roll was run. 3d6, in order (the proper order: S, I, W, D, Co, Ch), and you're stuck with those numbers. A couple of the players had some experience playing, and so gave useful advice like "you've got a high dex--be an elf and you're the thief." I think we had four players, each playing two characters.
After all that, I was hooked.