If you want to have some fun in battlegrounds try to play with Soul Leech (T1) and Burning Rush (T4). 24/7 absorb and 100% bonus movement speed, its faster to LoS or dodge some nasty melee on you.
I've always played destruction spec with my affliction gear and gems (full haste) and it works, most of times even outnumber mastery gemmed locks so its all upto you. The only thing I can suggest you is when you see 3 or more targets at close range in battleground Rain of Fire them, because it costs 1 gcd, but create insane amount of embers, locks rarely doing that.
If you want to practice abit pm me with your ingame name and faction, I have many characters on both sides. I doubt you can learn something just by reading articles. The only thing you have to do is practice, practice and practice until learn every class mechanisms to have some idea and prediction how they gonna act against you and how to counter their moves.