EDIT: If you are new to TWHL I suggest you look through the "Setting Up" tutorial found HERE and the "In The Beginning" Tutorials series that starts HERE.
Well this is a mapping site so I doubt you will find many coders here but your answer can probably be found in AMX server mod or some other server modifier? I think they you set which weapons are allowed on your server.
Also if you don't want certain weapons in your map just don't place them in there.