Add a wall sign and disable "monster"

[LeSanglier]

Hi,

I would to know how to add a wallsign ?
The following code doesn't work in my lua script:

Code:

setBlock(UpdateQueue, Player:GetPosX() + 3, Player:GetPosY() + 2, Player:GetPosZ() + 2, E_BLOCK_WALLSIGN, E_META_CHEST_FACING_ZM)

And my other question is how to disable the spawning monster?

Thanks in advance !! ::D