I started this gaming server back when I was a sophomore in high school. This started as a side project for fun but then it started to get serious when I purchased a dedicated server and web-host.
The emulator that was an open source from eAthena or rAthena. I took this emulator and customized the game to my liking. I was able to add new items, new monsters, new anything really. I took it upon myself and the only developer for the game. I also hired other staff who were players in the game. Their role was to create events for other players to participate in, just like in any other online games.
Esuna Ragnarok Online is still one of my biggest and proudest experience.