I also have a question. There is a “d66 spark table” but it’s not mentioned in the rules. Do I have to use it or is it optional?
Viewing post in Clarifying the submission guidelines
The spark table is in the optional section, you don't have to use it.
You also don't have to...
.... add details to the map, like dividing the map in regions, each with its own random encounter table.
.... add factions in the whole map or divided in the regions.
... add one or more dungeons!
... add a bestiary!
Hairic has added these details as suggestions to help people flesh out their "36-tile hex map with at least 6 points of interest". You can make the project as simple or as complex as you like (and have time for).