1.) download the cod4tools and install it.

2.) add all of those gsc files to the mod.csv  files

3.) make a new mod folder name it what ever you want

4.) open the start the MoDBuilder 

5.) set to find your mod folder

6.) make sure all the gsc files are listed

7.) check all the boxes in the iwd file list.

8.) check build fast file ... build iwd .... verbose info  click build mod.

it will put the mod.ff in your mod folder  set developer 2 run the server.exe check for errors in log file. 

there's a little more to it but like dpj says read the scripting guide in his link.

http://modsonline.com/Tutorials-read-477.html

http://wiki.modsrepository.com/index.php?title=Call_of_Duty_4:_Modding

http://modsonline.com/Tutorials-list-17.html

http://www.zeroy.com/script/
1.) download the cod4tools and install it.

3.) add all of those gsc files to the mod.csv  files

4.) make a new mod folder name it what ever you want

5.) open the start the MoDBuilder 
6.) set to find your mod folder

7.) make sure all the gsc files are listed

8.) check all the boxes in the iwd file list.

8.) check build fast file ... build iwd .... verbose info  click build mod.

it will put the mod.ff in your mod folder  set developer 2 run the server.exe check for errors in log file. 
Here is what the mod.csv looks like for promod so you can see how it's set up. Also what I used for my mod.ff you can just make a .iwd file and do the same thing for what I have in my mod.ff but somethings you need to put in a mod.ff. I just put images in the .iwd files.
mod.csv.zip