Quick question about the war3map.j

I know there are several other files that have to do with the trigger editor in general, but if I were to just code a specific war3map.j in, say, ultraedit and import it into my map, would I need any other files in there for the map to run as I have it written in my war3map.j? Like the war3map.wct seems kind of interesting because it has most all of the functions, just lacks global decrlarations and pretty header that the war3map.j has. war3map.wtg is just garble in notepad, and I am not sure what other files are used in conjunciton w/the trigger editor. I want to just code my own war3map.j and import it into the map and have it run without actually even touching the trigger editor. Would just the war3map.j suffice? Also, in global declarations pertaining to game generated ones, they are all set to null, but they all reference something on the map. When are those variables set to the item that they reference on the map?

For the game war3map.j is enough.

The wct (contains custom text triggers) and wtg (normal triggers) are just a representation that the WorldEditor can read.

Whenever you save a map it generates the map script from the wtg and wct.