A: Ditch the priest. Get someone patient and who wants to try something new and exciting.
B: PVP your ass off for the next 1-2 months if you want to catch up on gear. Do wintergrasp once a day, daily BG, holiday weekends etc. Even heroics (stonekeepers shards) count towards honor these days.
C: Do your 10 games a week, no matter what. You'll be in deadly gear within 2 months.
D: Be patient, and try to have fun. I'll be honest... until you really start getting the gear, 5v5 can be just so dam stressful. Enjoy the wins, laugh ur ass off like we do, and when you lose, pick 1 thing you did wrong and learn from it. I still mess up all the time, it happens (see: mashing my TS sequence when i get pissed at a cleave team... and burn them all at once lol)

Good luck, and those of us who have been running this comp for a while are always more than happy to help out! Dont give up, it DOES work... just requires an ass ton of practice :P