I have trouble with 'Ardrouine's lost boy' quest. I go to lighthouse and
kill all of the worgs but I can't find her son, and when I go back to her
she still says the same thing that I should go north-west. Should I enter
the lighthouse itself? If yes then how to do that?

I am playing Baldur's Gate and I am not sure where the Bandit camp is or
where I get the book to get back into Candlekeep
help!