Your gear is more than sufficent for tanking normals, infact its better than what i started tanking heroics in. You're 4% shy of the hit cap and 4 shy of the expertise softcap so make those a priority.
good start. Hit and expertise are not nearly as important as stamina and mastery are considering threat for dk's atm is a roflstomp. I'd say the stat priority right now would be stamina/armor/mastery>dodge/parry>hit/expertise. I've found reforging off some hit and exp to mastery or dodge has done a lot more for me than a little bit extra threat/dps.
Changing those trinkets to stam trinkets would be a great boost in survivability too allowing for more self healing and bigger bone shields http://us.battle.net/wow/en/characte...ieone/advanced