Please be more specific. What password? There is no password for installation, assuming you bought the game yourself. If you had the game gifted, there is no password either. If you bought the game in stores, the "serial number" (not password) for installation and registration on Steam should be somewhere on the box. Other than that, please specify WHICH password you want.
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On the back of the game manual/CD case, or on your Steam account.
4 players can play in Left 4 Dead 2.
It is a Key that will unlock the Left 4 Dead 2 in your steam library
Yes there is split screen for left 4 dead 2.
You can purchase The Sacrifice DLC for Left 4 Dead 2, which has you play as characters from the first game. Additionally, you can put character skins of the original characters onto the characters of Left 4 Dead 2 (Only in the PC version)