My first MMO was Ultima Online, it was a purchase I'd gotten unexpectedly because I'd been very polite and quiet during a trip out to a store. I spent all of my time listening to the music as it installed, marveling at that 80s as hell art it had in the installer. I'd read a few sites while I waited reading 'ways to start' and spent a huge amount of time after getting out of its incredibly dogshit intro just exploring the cities.
Eventually someone pointed me to training dummies to start getting my weapon skills up.. and I sat there beating the hell out of it. I was enthralled by how I was making actual progress and went hunting out in the woods afterward. I ended up stumbling onto the Britain Graveyard which had a lot of undead including some that could very easily blast your ass off with actually impressive magic. Died and ended up a ghost, struggled to run back but didn't make it fast enough for people to not loot anything worth a damn off my body because it decayed into a skeleton.
So I ran around like a hobo fighting skeletons and zombies to make money, I logged out in town eventually and was hooked.