Ultimate Werewolf Good 10-12 Player setups
The question is not completely clear. But I give it a try.

The balance between werewolves and good villagers is important. A rule of thumb is 1/3 werewolves. But it is not that critical. A single smart werewolf can win versus 12 villagers and 5 werewolves can be beaten by 12. Note that on a typical night the wolves eat a villager and during the day there is a chance the villagers kill a wolf. 
So if the balance (wolves, villagers) = (a, 2a). Then the balance on the next day is either (a-1, 2a-1) or (a, 2a-2). 

The normal 12 player setup would be:


1 Seer
1 Witch
1 Hunter
1 Cupid
4 Villagers
4 wolves


Idea's to expand the game:


You can experiment with additional roles to spice up the game. 
You can even try a game without wolves (the moderator selects the victim each night). 
Try adding a theme to the setting. For example Call the village Waterloo, the villagers are the french, the wolves are enemy spies and the Mayor is called Napoleon.  
Try adding extra elements.  For example, in the morning, there is a mysterious bottle in the village. The first player that drinks it, has the effects (this can be good (protected vs the wolves for the next night) or bad (you are dead)). 


In order to enjoy the game it is important to see it as a team effort. Even if a single villager survives, the villagers have won as a team. (Same for wolves). 

In a face to face game, I rarely let the players know in advance what the roles are. In a forum game, more information is needed so I often include the roles.