How do you get to mournhold? And do you have to have the game of the year edition to get there?
To get to mournhold you have to go to ebonhart and talk to Asciene Rane about transport to mournhold...pretty simple, and you do need the GOTY edition, because thats the one with the expansions tribunal and Bloodmoon. Going to mournhold will start the tribunal quests.
oh, and I saw another post about getting attacked by the dark brotherhood... As far as I know, you just need to sleep for a long time, outside is best. I was attacked the first time I slept in my GOTY game.
anyway, hope this helped.