Mafia is a debating game where scum try to overthrow the town, which usually has greater numbers at the start. They do this by performing nightkills and other tactics during "night phases" to shrink town numbers and throw town players off the trail. Town players, on the other hand, need to find and lynch all the scum via vote during the day phase, which is where the debating occurs. Some town players can perform skills during the night phase to assist in their efforts.
This particular game has RPG elements, so it'll be more complex than the basic mafia overview above. If you look at some of the previous games, you'll see many heated moments and shitposts. Your personality seems like a good fit for such shenanigans.