Making a map file from scratch isn't a trivial task, it takes some work at least.
For starters, I would use some sort of script to create map outlines into worldbuildersave file. For example you could try to do it with the application I created once: http://forums.civfanatics.com/showthread.php?t=460605
It's for Civ4:Beyond the Sword, but the map file structure is basically same as Civ4:Colonization.
Then you have to finish the map with for example worldbuilder(and text editor)... place the terrains/forests/bonuses... it takes some work and knowledge about WBS file.
Maybe it might be easier just try to cut down desired part from some existing Americas map.
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