If it was me and I was there free to talk then though it I would be very specific and very thorough. I'd listen to them and see that appeals to them about the idea, that kind of thing.
But in a broad general way, though, I would recommend a starter like fiasco or dog bear, if they have the previous genre interest in the ideas of these stories. If they're looking for something more generally crunchy I might kick off with a pbta like monster of the week.
And failing that, if they've got a pre-existing world interest in star wars I'd kick off with scum and villainy.
But yeah: dog bear or fiasco for absolutely new players who are interested in the improv narrative element.

