I took a look at your toon but he is logged out in his PvP gear. My main interest was weapon stats and gemming/enchants. So far I have been leaning towards stamina on my gems and enchanting so as to get his health pool up, but from my understanding of DK mechanics they need a lot of dps also due to dps being their mechanic to create aggro.
I am toying with the idea of using the weapon from the battered hilt for his main weapon (have 3 of them sitting in my bank and not sure what to use them for due to the market being dead for hilts on my server)
I presume agility is also something I should be enchanting/gemming for to give him more avoidance?
I agree I need to play him solo and I did try one random dungeon last night but the healer was constantly going afk "chatting with their guild" and so I just ended with a repair bill from it. Other than using random dungeons i do not see any other way to learn the mechanics other than in my own team, pugs would be way faster to gear up in though