If you know who the officers are, first check where they are. If they are in:
Any PvP Battleground
Bastion of Twilight
Throne of the Four Winds
Any Cataclysm 5 man
Then it is unlikely you will get an instant response and they may well miss what you said - I know that in raids I hardly ever look at my chat window, and in PvP I am usually dribbling all over my Ice Lance button or exploding in furious bouts of swearing over ventrilo, neither of which mean I am concentrating too much on what is going on in my chat pane
I have un muted you now that you have a chance to cool off, and sent you the item you requested. bear in mind those items have a stat called "Resilience" on them, which instantly flags them as PvP gear. PvP gear is less than optimal for dungeons at 85 and so should be avoided. Your best bets for gearing up for heroics are: Crafted epics (which, I appreciate can be hard to obtain for a new player, given their cost), spamming normal mode 85 dungeons (open your dungeon finder window, and click the "random normal" button) and reputation gear. Rep gear is very good, as even at honoured reputation you can obtain item level 333 blues - the max item level pre heroic 5 mans.
If you have any specific questions pertaining to Mages or gearing them up then poke Slashgordon, I'll do my best to give you pointers.