Where can I get a copy of your zombie rules and how many zombies are needed?
PM me your email address, and I’ll send you a copy of the rules.
Re: Zombies - As many or as few as you’ve got - the more the merrier, but you can recycle, and if you’ve only got a few zombies, give your players less weapons, or make the table smaller to compress the action. Have a couple of games and you will get a feel for what is right - all the players are survivors, and the zombies are controlled by the cards and activation range (sight/smell/sound).
I’ve quite comfortably had 500 zombies on a table with 8 players with 3/4 characters each and a game that flowed well, but equally you could have just as fulfilling a game with 30 zombies, 3 players and 2 characters each. The game lasts as long as you want - it depends upon what objectives you set them...escape, scavenge...and how quickly the players die...if they die quickly, just start another game.