To consume, the only changes to WoTLK Gold are that we can no more use oils since oils no longer work on items with an item degree greater than 160. There's no oil or the Wrath Lich King that can replace the old oils.

We also can don't use Craig's anymore as Craig's has been categorized as a food buff. This means that you're not likely to use that either, you're still able to make use of crystal of insight for Alliance however it's just five and so currently is certainly not worth the cost.

But if you want to go on at the maximum level that point, the important things to do is make sure the flask is in place, the new flask class and the frostworm 125 spellpower as well as the food you eat to buy WoTLK Gold boost your spellpower.