look i am no expert here but i can give u some advice especially for thundrarr quest.
see the following link :- http://folk.ntnu.no/houeland/adom/results/datadump
here you can find the dl of ne monster i the game. using it i found the dl of werewolf lord to be 12. that means you can only find it on d12 or below (d13 d14 etc.)
also see this link :- http://adomgb.sweb.cz/adomgb-app-L.html
here u can find dl of places.
next thing is thundrarr quest while they are not essential are pretty damn worthwhile and u shud definately have ur game revolve around completing them. here are some tips..
goto smc asap and spawn low lvl monsters there. if u dnt fear the rng 2much explore it till u find the downstairs(optional) and waterproof blanket (absolutely essential)
next if u dnt have herbalism do visit the dd and ignore the carpenter cave e1 if u dnt have healing (healing is overrated) get it and COMPLETELY IGNORE PC (its a death trap)
next goto coc and DONT EXPLORE THE ROOMS just head directly to d8 collect the sis and then goto thundrar get his quests (random monster and portal) and then u have finished ur early game and are now in the mid game.
i do this and 50% of my characters reach this point just saying!