Finish an Era with a Village with 400 Village Prosperity, and at least 8 Mountain Patches within its borders
A village will only appear once it has resources to attract it. As such, this development is easily manipulated. Using the rock Giant place one mountain. now count 7 tiles into your desert and grow the second mountain here. With your two mountains up proceed to place a resource on the lowest part of either mountain.
A village will now settle in the valley between the mountains and will only be able to expand its borders over the mountains.
In terms of generating resources a mix of Ginger and Agate are sure to set you up well, with some animals feeding resources into the borders through their range. A good pattern is Agate, Ginger, Ginger, Agate. This allows you to improve your Ginger to Cinnanomum and your Agate to Onyx later on with little issue (you will need to add an extra ambassador or two from extra villages, but that’s a simply case of finishing a project or two.
Proceed in this fashion, adding resources to both mountains, and your village should expand with little issue.