hi! some spoilers here ;)
the haunted house is the first quest given by the major of the capital city, in the guard HQ, you may ask the gatekeeper about and she opens you a small sidequest to meet the captains.
the mothgirl sidequest is thefirst quest given by the magicians in the tower of wisdom. To unlock the tower of wisdom, you need first to defeat Enilynn after chapter 5, in the harbor city, then join her.