Just cause I'm looking for somewhere to type, I will respond here. z.z
So yeah, SJ totally has tons of information. It's a pretty useful site. To answer a question you posted right here, for most standard 2H Unholy Rotations you'll use:
IT-PS-SS-BS-BS-UB -> SS-SS-SS-DC Dump
There are a few rules though:
1. Don't ever cap on RP. The the next attack would cap you, Death Coil (Or UB if it needs refreshing).
2. If your diseases are about to run out, replace the first or second SS with IT-PS. Don't get caught with no diseases and two blood runes!
3. Use Blood Tap + Ghoul Frenzy when possible.
While my main is a mage, I dabble quite a bit with my Death Knight. I've seen decent success with a deep Frost build. I'm sure you can find a build easily on SJ or even EJ. It's something like 17/51/3 Or 13/51/7. The rotation here would look something like:
PS-IT-OB-BS-BS-FS Dump -> OB-OB-OB-FS Dump
There's been some debate on which presence to use, but I recommend trying both and seeing your DPS. I've gotten like 3.3k in Unholy on a dummy. Also, it's worth noting that since so much damage comes from FS, the T7 4pc is quite strong here. Also, if you happen to get the new sigil from XT-Deconstructor that is preferred.
I don't enjoy Blood so I don't have much to say there. ^^;; If you have any other questions I'll do my best to answer!