You're kind of asking two separate questions.
You can start a game lobby by choosing that option in "Play Online."
You could also design a full level yourself by downloading the Left 4 Dead SDK (Source Developer's Kit) and designing a campaign yourself.
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.
yes left 4 dead is the best game ever
No, left 4 dead will only work for left 4 dead mods.
yes they will because left 4 dead is a popular game
No it is a Xbox 360, PC game and will not be out on the PS3 and neither will left for dead 2
Left for dead is not an rpg game but instead a first person shooter zombie game.
Left For Dead is so much better! Left For Dead rocks!
simple you cant =/
yes
left 4 dead, dead rising, monster madness. Warmaker Zombies MMORPG - See the related link.
That is yet to be seen. Left 4 Dead was a HUGE hit, Left 4 Dead 2 was good, but did not get as much attention as the first game. It is possible they will try to perfect another one to match the first, but usually if they make a 2nd game and it doesn't do as well as the previous, they will give up and move on too making a totally different game. I was a fan of the 2nd game, but I just don't see them finding the motivation for a 3rd.
definetly left 4 dead 2 i have it best game ever trust me u will like it :)