Fresh 85

Hey all, I just hit 85 last night and this my first max-level character. I read the Pre-Raid item guide stickied which is great and I will be using it to maximize my time in-game. My question is about when do I start bothering with enchants, gems, etc? Am I expected to have all this done before my first heroic? Is there a magical item lvl to aim for for gems/enchants? 333, 346, purple only?
i started gemming and enchanting my gear at 346 mark. mind you, not on this mage, but on my druid.

dont bother gemming and/or enchanting 333 gear imo.

i started gemming and enchanting my gear at 346 mark. mind you, not on this mage, but on my druid.

dont bother gemming and/or enchanting 333 gear imo.

Please don't listen to this bad. Enchant/gem your gear no matter what. All skimping out on gems can do is hurt your performance. You don't even have to buy the expensive ones, every little bit helps.
^^^ This. Try and always have your gear at its best potential. Put a belt buckle on your waist and gem it with a +40 intellect gem too. I am a fresh 85 as well on my first max-level, gratz :)
Like the other guy said, it's not worth the expense to gem/chant anything you already have when you hit 85. The only things worth gemming/chanting are gear you get from heroics, and gear you get from the justice point vendor. Anything other than that is a waste of money, you'll be replacing it in a matter of hours/days. Besides, if you're arcane (you probably should be) it's very likely you'll have threat issues with a lot of tanks in heroics even in unenchanted 333 gear, let alone chanted and gemmed 346+.

tldr: the other two guys are wrong, don't waste your gold on stuff you'll replace instantly.