Dude, you haven't even played one yet. You also don't seem like you'd know how to be a good host. From the host side of things, Mafia requires commitment I'd think you wouldn't be able to have that. Wait a couple of years, then try to host one you'll need the extra maturity from growing up a little. Now, don't take this personally, but I wouldn't want to play a game where I can't be as aggressive as I usually am. That or playing a game with a host that might give off things. That or playing a game with a host that does things at random.
Like seriously get some experience with stuff before you want to host a game.