I have a level 76 Frost Death Knight, and I suck in battlegrounds. I know I will probably get crap for having a DK, but please know this is not my only character.

How should I gear her? I know I need more resilience, but what else should I look out for when choosing armor? Also, whats are your techniques when actually playing? For instance, I press the action bar with my mouse and move around with my arrow keys when I"m fighting, but I don't think this is the right way to do it, because other people move around me so quickly, and I don't know how they're doing it! Maybe there is an addon I am unaware of? I have x-perl unit frames.

I know I must sound like a complete noob, but I guess I kind of am on this topic. I want to start spending more time in battlegrounds.