if you're asking how to find eastbrook-
I don't know how I did it. It might just be time based- I let a few days pass. But I also did Ash's date, then afterwards went back into town and asking finn if he needed help finally gave me the quest to go check out eastbrook.
so again, no idea what triggered it, but that's what I did before the quest popped up. hopefully this helps.
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Hi! Eastbrook is triggered by two different conditions!
1)You have to have read the book that shows up in the cabin
2) Afterwards talk to Hanok about the contents of the book and then ask Finn if he needs help
I believe in 0.11 though Ash has also tied it into Hanok's personal quest so if you dont trigger it through the book you trigger it through that.