This is where you get them all:
http://wiki.treyarch.com/wiki/Downlo...ling_The_Tools
Choose one download from each section, save it in downloads, in total all these folders are up to 4GB, I'm not sure, but it's higher than 1GB.
So it's a BigDownload.
My prefered reference is bigdownload and gamershell but it's completely your choice.
Once installed, double click the folders (rar) and extract them to CoD:WaW.
If Vista:
C:\Program Files\Activision\Call of Duty - World at War
Extract them in the order of mod tools use, you obviousbly can't install the latest patch before the one that was released before it, so do them in order.
There may be a few problems when trying to find/open CoDWaWRadiant, but I'm not really experienced with getting into the technological details, maybe waffles/xylozi can help you out there - if you ask him nicely
Once all extracted, go to:
C:\Program Files\Activision\Call of Duty - World at War\bin
Open CoDWaWRadiant.
Begin Mapping
Good Luck & Regards.