The most common second skill to enchanting is tailoring. It doesn't require a supplementary gathering skill, and you can use it to produce greens for disenchanting. I agree with Draak though, that enchanting will eat a ton of money before you start making any with it.
I never really had a shortage though and when I hit 300 enchanting I had given up on tailoring way back at 130ish. Take a gathering skill and just use your enchanting skill for melting instead of actually trying to level it. I'd have taken mining from the the start if I did it again.