[C.G]

I'm too lazy too read on lol Miniumum Required: Your time to plan, organize, go through rules.. lots of coffee.. there after, your imagination and creativity... if you can't get props or work with anything this would come in -very- handy.. there after, good group of players.. full face masks.. - good 'story line' so it's not just 'ahh zombies kill em! die die die!' although that's fun...
Otherwise think of a zombie outbreak situation, classic small town, or biohazard project gone awry, what kind of zombies do you want running around? Those that can adapt? Those that amble around? Total brain thirsty freakazoids? - There after on game day, be willing to play Host, realise you might not get too much game play in, like Z said, but if you want to play, make sure you have a few bitc--er 'helpers' around incase problems do happen or just to make sure the rules you put in place are being followed.