I'm not sure if you can do a small then build outward map with that one. You can do a less detailed whole world and then edit a small space to focus on and go from there, I think. Have not explored it fully yet. 

There is a [url=https://github.com/Azgaar/Fantasy-Map-Generator/wiki/Quick-Start-Tutorial]tutorial[/url] and wiki if you haven't found it yet.