So I picked Lord Harrowmont and defeated his champion, now I'm sent on a quest to eliminate the dwarven criminal gang in the Dust area. I've managed to question three dwarves (including the shop owner (who I killed after getting the information). The shop owner said they were walking THROUGH walls, and I've been trying to run through every wall in the Dust-area to no good end. The girl by the fire told me I needed a special key to get through the door that has a finger-sized hole that's all black in it. But beyond that no one tells me anything further, and getting through that door seems nigh on impossible. I'm grasping at straws here since I've done pretty much all of the subquests I can find, and the dwarves are the last on my to-do list of recruits. So there's nothing much else for me to do. A hint would be appreciated.

Also about Sten's sword, I didn't get the dialogue option about him losing his sword until after I conquered the undead near lake Calenhad. I've come to understand you need a dialogue with a certain Scavenger at that same village, but he is nowhere to be found. I also spoke to a suspicious guy up at the entrance to Orgrimmar ( WoW-typo intended) but beyond some suspicions from Sten, nothing gave me any new dialogue options with Dwyn (who I know has the damn sword).

Dunno about Sten, only saved his ass and never used him really. But in the Dwarf city, go to the Slum House at the end of the Dust Town and you will encounter the thugs who have the key and will give it to you when you beat them up

The house, it's empty.

in the Mage tower, I killed Wynne, but now I found out she;'s a companion..and a healer at that..I reaaally need a healer..I have progressed for houres beyond that point and I am looking for a healer.

Iis there anyone else that can do healing for me or am I royally screwed? ( I prefer Morrigan to be destructive magic oriented as much as possible:)
Those health pots ain;'t all that,..