All right, I've started claiming land, for now only my structures in Ja-Min. I like the map capability... maybe I should look into getting myself a minimap.
I've also begun (and am almost done) a railroad from the mining town (sorry, can't yet remember the name) to the villages to the south of Lucas' town; it passes to the west of it through forest and mountains, so it shouldn't be in the way of anything. It can also be the basis for future extensions into other areas.
@LucasFIN: Interested in connection your city to the railways? You'd have to build the station, but if you want, I'd connect it.