Left 4 Dead begins in Pennsylvania, following an outbreak of so-called "Green Flu" (not actually a flu, but a form of rabies), a highly contagious virus causing extreme aggression and loss of higher brain functions. It was spread through biting.
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To play as a zombie, you must play on the infected team on Versus mode.
No, Left 4 Dead does not have a split screen option. The only way to play with someone is online.
To text on Left 4 Dead 2 is the same as in Left 4 Dead 1. To talk to all players on the server, press the "Y" button, type in your message, and press "Enter" or "Return" to send your message. To chat with your teammates only (survivors or infected), press the "U" button, type in your message, and press "Enter" or "Return" to send your message.
the campaigns for left 4 dead are: NO MERCY BLOOD HARVEST DEAD AIR DEATH TOLL
There are a few sites, check out the Left 4 Dead forums online.