Easy:
Get gear for starting BG, get level 90 gear at min, doesn't really matter. You will be weak and squishy at the start so aim to stay back a bit and only fight with a group. After a few BG wins you may have enough points at the Honor Points Vendor and buy your self some gear. (I usually go for Weapons, Trinkets, Necklace, then full Armor) And go ahead and get a full set of Grievous armor. After that, do some 2v2s. Ask in chat for someone to help you and you usually find someone. After that, go ahead and win a few and get Conquest Points. Then the Conquest Points vendor will sell you Prideful gear. The highest ranking gear so far. Get that.