You use the same tools that you use to make a zombies map.
Radiant is used for map editing.
I personally use notepad++ to script my maps.
Singleplayer maps are much harder to make than zombies maps, due to the amount of code you have to write. (This map had around 1000+ lines of code).
There are tutorials to follow that could help you with singleplayer mapping on the modsonline website. (The tutorials in question are actually in the cod4 section, but these games run on the same engine).
sexyseaturtle
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