I found a tutorial on setting it up that includes a bunch of mods to fix common errors when going over the 8 players.
the mods I have downloaded so far are:
Left 4 Downtown
Admin Cheats
Super Versus
Remove Lobby Reservation
Left 4 Dead Infected Fix Respawn
The mods I can't seem to find are:
Left 4 Dead Toolz
L4D Mapchanger
Vote Manager 2
This is really I my 1st L4D2 mod install. I like to do it right and this tutorial I am reading comes from a site that hostes many L4D2 8+ servers that seem to get alot of people playing in them.
I been over to alied modders and these last 3 I just can't find

If anyone else knows of the config I am setting up and got the files I need or know where I can get them, could you please post here.
Thanks,
Elochai AKA Scott