You should make a ton of wow gold.
Here again, I know most people would argue this point, but for the amount of wow gold it costs you to level these up, it's not worth it for what you get in return. These will absolutely bleed you dry before you get to any decent level.
Most people think of greys as garbage to be unloaded at the nearest vendor, but you'd be shocked how many people are looking for nondescript items to be used for crafting.
Not to mention the fact that you'll out level any gear you buy in a week, which makes it a losing proposition. This is especially true if you are a melee. In that case, save your money for a weapon – this will help you level faster than any gear ever would.
By having these skills, you can create a steady stream of income from the sale of your items. Make sure you spend some extra time in the badlands, wetlands, Hillsbrad and the Barrens. All of them have some great areas for harvesting so you should make a ton of wow gold.