Level 80 Gearing - Which rep should I farm?

Hi-- I played vanilla back in the day and don't understand WoTLK end game.

I'm a tank/heal paladin. Gear score: ~4000.

Here are a few questions I have:

1. I see I can purchase tokens from Silver Enclave to get rep for different factions. Which faction should I be farming rep for?

2. Where should I spend my time to increase GS? It sounds like I should just farm FoS, PoS, and ToC normal to get to GS 5000 Is that right?

Thanks!

Reps? Most of them provide items that can be useful to you. If you have the atlasloot addon, you can check and see what items are available from each rep easily.

Dungeon farming (heroic dungeon finder) is usually the way I'd go about farming when I'm alone. Until you can't get any more upgrades from the vendors. If you have a guild, you can probably get into whatever guild raids they host, especially Ulduar and Trial of the Crusader.