Huh, that's a really interesting gaming background you've got. Like most players, I learned from dungeoncrawlers, so I take for granted that adventuring is just A Thing that PCs do. Try providing fantastic locations, mysteries, and artifacts. Those things tend to drive the party to action all on their own. People who are signing up for a dungeon game are automatically on board for the premise, so if you show them potential adventures then they'll probably grab what interests them most and run with it.
If you already feel comfortable building NPCs and factions and stuff, just concentrate on neat ideas for adventure locales and the rest will probably take care of itself. That'd be my advice.
Edit: in other words, I honestly think you can be like "adventure this way, take it or leave it" because who's really showing up for Dungeon World so they can say "nah, I'd rather not brave the Swamp of Doom to find the Golden Idol, that sounds unpleasant"