Maybe you should see a doctor about that
The links Diwa posted are probably your best resources for sure.
Personally I have a DK tank for my team and I have an unholy spec for running 5 mans with them that gives me ebon plague for ripping through heroics. I also have a blood spec for raid tanking which gives the best survivability and single target threat.
For a newly geared DK tank, I would recommend with starting using a frost build (see EJ for specifics) as this is the least gear dependant and gives good defensive abilities whilst having the best multi and very good single target threat.
Cheers
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