One of my guildes gave me a write-up he had about the crafting skills. I lost it after I re-formatted, so I'll post from memory.
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CRAFTING 101
By: Vespion
Original Author: Mechanic
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NOTE: This is just a suggestion, you DO NOT have to take this route.
First off, I'll list the skills to take at what level.
lvl 1-40: Gatherer. (Mining, Herbalism, Skinning)
lvl 40-60: Whatever you want.
The reason for this is...
1. The gathering skills will bring in alot of money early on. That's what your after when you craft anyways.
2. You wont waste any money leveling these skills up. (auction house fee, mining pick, skinning knife)
3. You do them as you level. So you'r getting money and exp at the same time.
Now, I've done this with a warlock. I made ROUGHLY 175-200g in the time of level 1-39(almost 40). This does NOT include drops I got from mobs/bosses/instances/ect. AFTER 40, you can use the money you made to power yourself through a manufacturing craft like alchemy, blacksmith, leatherworker, ect.
Now, your wondering, "What about armor, weapons, ammo, food, ect?"
Well, this was my question at first. What you do is put some of your money away. (Send to an alt) Then with that money, you buy what you need. My warlock got most of her stuff from instances. I went to thottbot and looked at blue cloth drops then farmed the instances they dropped from. For example:
lvl 24-26: Robes of arugal, belt of arugal, Feline mantle. All cloth blues from shadowfang keep. Each of those items has +9-10 Int EACH.
That's about it. You can do anything you want with professions, this is just a suggestion that was given to me. I tried it, and loved it. Do what works for you, and just have fun~
-Ves