Sterotypical: no no no. I mean an example Setup to the game with the players and their roles.
i.e. An example setup to Beginner's Mafia is:
9 players
1 doctor, 1 cop, and 5 townies vs 1 mafia roleblocker and 1 mafia godfather
Unless it's a Bastard game (thus the setup has to be hidden) you should be able to imagine how a game would turn out. How many players would be playing? How many of those 'groups' and how many players will be in each? How many scum and what types?
The setup would change each time, but seeing one example of what could happen will give a good idea on how the game would fall.
School Mafia:
well, it sounds like instead of killing there will be painting. Why would the punks want to paint and how would everyone else use it? What's the goal of the sides?
In a normal game, the town is driven by the fear of death. They know that if they sit around and do nothing they will be killed-one by one- in the night until they lose. That drives the town forward towards the hunt. The scum, meanwhile, are driven to commit their night actions to shrink the town because that's how THEY win. The scum are also driven to duke it out with the town in the day game because they know if they don't 'look town' they'll be lynched and will lose.
Thus both sides have distinct reasons to perform their actions-assuming they want to win.
OTOH, in Religious mafia, there was a town that won by surviving or being converted. This meant there was no real incentive to find the religious (except perhaps the Zealot which could kill). Thus they turned VERY passive and rather inactive.
When you add something 'non-typical' there's a risk the players will play with it then get bored because they don't feel a drive to use it. You need to make sure there IS a strong, easy to see, drive to do what you want them to do rather than just sit there and flake.