If someone wanted to write an 'advneture picto book' of their own (not taking place in DC/Marvel's worlds) is there any advice you could give on getting started, things to look out for/avoid doing or anything at all that could help get the idea off the gro

Everything looks easy if the person doing it knows what they’re doing.

But you build a believable world from a blank page, that’s a skill not to be trifled with, frankly.