Yep. There have been problems since launch. It's buggy.
get it online or from the local stores, http://www.allcdkey.com/Left-4-Dead-PC-Games.html, spend $29.99 for left 4 dead
You cant play as the director, the director is on every server and its pure AI controlled.
There are a few sites, check out the Left 4 Dead forums online.
Yes you can play online
You have to use Steam. Google Steam Tank Rush Server IP and then enter that server.
No
Left 4 Dead is quite a good game if you like shooting zombies in an online mmo style. But, if you already have left 4 dead, you should get left 4 dead 2.
In my experienced, you can't, I assume you to Play Versus and Crete Lobby instead instead Dedicated Server.
If you haven't changed it it is Y for server chat and U for team chat.
Its both Singleplayer and multiplayer
A sex server
Left 4 dead