Since I know the two original people who asked that a game be started have had trouble with games staying open, I'll go ahead and share a little bit of my experience as well.
My name is Jason, and I'm from Texas. I've been playing D&D for 30 years, and I've been playing on RPoL for somewhere around 20. I didn't think I'd stick with it because of how slow things were, so I didn't even pay attention to when I started. I've easily played in over 100 games here over the years, and the vast majority of those simply died at some point rather than reaching any kind of conclusion. I think I've only taken a break from the site twice in those 20 years. So rest assure that I'm not going anywhere. This game will be here for until you all get tired of me and quit, or we kill all the things and hang up our swords on hooks made from dragon claws.
I can't really tell you what my first adventure was because for about the first 3 years it was 100% made up garbage from my brain. My mom bought me a PHB from a garage sale for $0.50 because there was a wizard on the cover. She had no idea what it was or what was in it, she just thought I'd like the wizard. I remember the first game I ran with one player, he was basically Conan in the gladiator pits I threw monsters at him until he was the champion. We didn't have dice, didn't know what they were or where to get them. I didn't have a DMG or a Monster Manual or anything of the sort, so I made all of it up.
The first time I ever got to be a player in a game that was really being ran, it was similarly made up on the fly. I was a solo Gnome Wizard named Ares, which I renamed partway through the session to Davidius Johanus so I could be David the Gnome. I was a level 1 wizard, and I found a Ring of Shooting Stars and a Necklace of Fireballs in the first two rooms of my first dungeon. I was inspired the instant I read the descriptions for those magic items, and I've been obsessed with making custom magic items ever since.
I remember the first boxed adventure I played through, but I don't remember what it was called. They wanted you to jump right into playing so you didn't make your character before the session, you just picked a name, gender, and race. Everything else you came up with as you went through the dungeon, escaping from prison, going through salt mines, freeing prisoners, finding a werewolf in a silver prison. It was good times. I even ran myself through there solo like 8 times because it was so cool. I had an 8th grade assignment to write a story, so I played through and wrote the story out including dialogue between my characters and turned that in. My teacher told me I "have a rare gift" and encouraged me to be a writer. It was like 80% plagiarism, but I didn't tell him that.