This tutorial have been created from The European Map, but the install of the maps is the same process.
First dowload the files required for the map:
https://drive.google.com/open?id=1X7F17iYnNyPVYakjg_fCLWW_oXSL40od

Go to the game files:

Go to map, paste the png images in backgrounds, paste the map files in the folder and edit the Age_of_Civilizations.json

Made a new line like this with the name of the map files:
Not modified: Modified file
 
And finally try the map.
In game captures:
Go editor

Map editor

The installed mod

Loading map

Loaded the map

Scenarios

Connections of provinces

Sea provinces, my map have some bug 😛

Thanks for read
 

Dosnt have to be keplar it can be any other planet

Okay it's in works, right now I'm working on Hashima islands 😛
Map:
SCENARIOS:
SCENARIOS 2: