I played in a few games and would say I’m quite familiar with the game, but even then I never really made my own quests. The example quest-sets tend to be vague enough that they fit most characters, so I just stuck to them and switched out some of the xp earning scenes and milestones if it fit my character better.

There is a bit of information in the Arcs section of the book, there is a list of all the Arcs and what each quest in the Arc should be about + suggestions for the rewarded perks.

Glass-Maker’s Dragon can really help understanding the game a lot, if you have access to it from the kickstarter. (Unfortunately it’s still not out)