Buy som very cheap 458 pvp pieces from AH (good for transmog later) first, and then do the first quests on the isle while looting chests, you should be able to get some 496 pieces doing just that. Then join in on some rare kills, you will learn their location in no time. Even if they don't drop what you need, people that joined in on the kill can sell you their loot from the same boss. Usually they are very cheap, cause when you're farming coins later you will get so many that you vendor them anyway. You should queue for headless horseman, which drops a ring for you at least. Also, when you're about 480, you can queue for Throne of Thunder LFR. It's a fairly fun dungeon, and you can get yourself a 502 weapon, while also get quickly up to friendly reputation with Shado-pan assult, which sells everything but weapons (ilvl 522) for valor points. Now you should be closing in on ilvl496 and can start SoO-raiding. It's all good from here
Don't forget : You get a lesser charms from various sources on the timeless isle (currency), use these to buy warforged seals in the shrine. They will grant you an extra roll on the LFR/celestials loot. I got a bit lucky on my monk the other day, got two ilvl559 items on the same Ordos-kill by using one of the seals. These can be bought once a week, and you get three seals.
5.4 kicks ass, enjoy!
Edit: If you have some justice points, I think you can buy a lot of 489-epics with the different factions without any reputation restrictions, but I'm not sure. Go check the quartermeisters. Also, there was a 502-boot quests which was really quick, that was available during the build up to 5.4. It should still be around, but I don't know where it starts after the darkspear revolution ended.