Generally speaking, you should only level a crafting profession during levelling process as a form of roleplay. It is much easier and more time- and effort efficient to level a creafting profession at max level with bought materials. While levelling, you are much better of with two gathering professions and just selling your output, occasionally buying a green or blue item on AH for a slot you haven’t had a quest reward upgrade for in some levels. As a warrior, that would 90% of the time be a new 2h weapon.
Blacksmithing at max level in Wrath is a good profession, it gives bonus sockets and allows you to craft some juicy PvP and PvE items. But again, much easier to get at 80 with bought mats.