Day 1: How You Got Started
I got started in 1979. I was in "silent reading" and a buddy had a copy of the new AD&D Monster Manual. WOW. IT blew my mind. I loved mythology and had already read everything in the library on Greek and Roman myths. Seeing all the same creatures, plus demons, devils and things I never heard of.
After that I looked for the rules, but to no avail. It wasn't until I got a hold of a badly xeroxed copy of Holmes D&D. The rest was as they say history.
Around this very same time I discovered the Hobbit, having seen it recently on TV. I was in the right place at the right time for this to happen. Like many my "first" D&D was a combination of Basic and Advanced. Still today that is the same experience I look for in D&D. Also recapturing that thrill of first holding that Monster Manual in 5th grade.