If you want to learn the real way, prepare to read a lot. Two very good guides are
here by Monty_Python, and here which is mostly by Matie (you know, the guy who made Norse Wars?). Also, you should read the guide that came with the game, which is available in the Docs folder of AoM.
Of course, you could always take the easy way out and use Mapgen, but this can only make basic maps, so I would suggest learning the hard way.
Either way, good luck!
oh you can wait for what I can give
you know what I am so you know how I live
try to look proud but you’re not in the slightest
its happening now and it’s always been like this.