PvP at lvl 60

1. Get Action Bar Profiles to hot-swap your PvE/PvP keybinds: https://github.com/Siventt/ActionBarProfiles
2. Get Outfitter to hot-swap your PvP/PvE gear: https://github.com/pepopo978/Outfitter
3. Go to the Gurubashi Arena and spend 350 gold to get the Goblin Brainwashing Device, which allows you to have dual specs and swap PvP/PvE talents for free
4. Get gear with a lot of stamina, and replace your “% chance to hit” gear with something else

PvP Gear progression

PvP will grant you a rank, and honor to spend on gear. You cannot earn more than 20k honor/week.

T1 rare PvP set

Costs a total of 24,000 honor to get the full set (about 1 week of lvl 60 bg grinding).
Unlocked between ranks 6 and 8.
Great pre-raid items.

T2 epic PvP set

Costs a total of 120,000 honor (around 6 weeks of lvl 60 bg grinding).
Unlocked between ranks 9 and 11.
Near T2 (Blackwing Lair) PvE power level
You need to buy the T1 gear to upgrade to T2 gear.
Phase locked?

T3 epic PvP set

Costs a total of 376,000 honor (around 18 weeks of lvl 60 bg grinding).
Unlocked between ranks 12 and 14.
Near T3 (Naxxramas) PvE power level
You need to buy the T2 gear to upgrade to T3 gear.
Phase locked

T2 epic weapons

Unlocked at rank 6.
Cost 14k–18k honor.
Between T1 PvE power level and T2
Phase locked?

T3 epic weapons

Unlocked at rank 14.
Cost 44k–48k honor.
Same as the old rank 14 epic weapons.
Phase locked
You need to buy the T2 version to upgrade.

You can check them out there https://mrdobby92.github.io/TurtleAtlasLootWeb/pvp on the 'PvP Armor Sets' section (its missing the T3 epic set though).
Best way to grind honor is playing Arathi Basin when its AB Day, and win games of course.