Need some help with L4D

[g3344]

1. Definitely not, just like other FPS games.
2. Just start your game, there are two kind of types, campaign and versus, campaign is a mode for 4 players in total, you need to complete 4 stages of a level to escape and than there is versus; 2 teams with 4 players in it each, one team contains humans (Bill, Zoey, Louis and Francis) and the other zombies (Boomer, Smoker, Hunter and Tank)
3. Nope, although it can be handy.

*cough*5*cough*