I hear you Angelistra ... the manuals that Dulux has put together are quite comprehensive and well done, but i think i know where you are coming ... a generic town/city that we could start using and customising, or using. To that end such a generic module doesn't exist.
The way this extension works is that everything is setup so that it can reference each other within the extension. So you create a land/area/zone, then create town/capitals/etc and tie them to that land/zone, then make buildings that are within that town/capital/etc, and finally NPCs that might be within said buildings. It takes time and you could go about creating a WHOLE lot (i.e. a complete world) ... OR ... just create 1 or 2 sample things and leave it at that.
So ultimately decide what you want to make (i.e. a building like an inn called "Troll Droppings"), open the location dialogue, select from the right tab "buildings", right-click and create a new record. Then populate that record as you like. Do you need to tie in a town, or world, or other location ... no, but you can if you like. But my suggestion is that you create objects within each of those right tabs in the locations dialogue, and then inter-link them as you see fit. Within the Inn object i just created i make sure to addin some good details on the main tab like "markup" from the NPC that owns this inn, as well as his "Purchase At %" ... then i start dropping in items from the "Items" dialogue. You'll notice that value of items dropped in to the Inn's inventory will be "Marked Up" with the % that you entered (e.g. the innkeeper markups all his goods by 50% means a healing potion costs 75gp instead of 50gp as per the PHB stats). Dulux's user manuals will describe each variable within these dialogue windows, and give a description. So if you wanna know more about the "Hide from Players" option, then it's described within his user manual.
As for dragging a map ... not sure about that. If I remember correct I can create a building within a town, then drag that building record onto the towns map, and now players can interact with the builiding directly from the players map that you've shared with them. Just as well if you've an overview map, you can drop a pin of the town record on that overview map, and the players can select that ... or perhaps you drop a pin for another map so that from the overview the player can also open a town overview map. So why not drop both pins.
As you get more familiar with the ins and outs of FG, a lot of what i've rushed through in stating here, will become clearer.
For me and from an engineering background i can see/recognise the internal dependencies that Dulux has created with the core FG things like NPC/ITEMS/MAPS/TABLES/etc, and therefore the important part for me was his user manual descriptions for the various "options" that he created within the extension (i.e. like the "Hide from Players" option on the Buildings record's main tab).

