DK Help Request (Quite a bit needed)
I'm sorry if this comes across as unhelpful, but... When I read your post all I can think of is the SNL skit about the IT guy who always gets frustrated helping people and yells "Move!"
By that, I mean my first internal reply was, "Do you want me to play it for you too?"
If you have specific questions, it helps a lot. To answer everything you have asked would require a book...which has already been authored, thankfully. Check this very site for the DK guide by Satorri. Grab a snack and a blanket because it's a long read that's well worth it.
As to cata, enjoy the time you have before that. Still have plenty of time to gear up and get some experience. There are already gear guides and pick orders in threads on this site. A good one called gearing your tank in lfd (or something very like that) is worth your time to review.
As for macros, I would macro rune strike to IT, PS, and your signature strike(s), heart strike or oblit, frost strike, HB.
As for target of target...don't bother. As often as not, the mob aggro'ing the other person is not one they are targeting but rather general AoE or healing aggro.
Tidy Plates: Threat Plates (requires the base Tidy Plates)
Who Taunted (preference)
DXE or DBM
"he doens't need healing, he doesn't need healing, he doesn't nee-WHAOSHIT!wtf was that man!". Please stop leaning on TDR. -Teng