Brake pad adjustment (one is further from the rim than the other) is a trivial issue:

Even if this is a junky brake with no adjuster grub-screw (centering screw), you can simple loosen the nut on the bolt that holds the caliper on the frame, tilt the whole caliper to make it centered, and retighten the fixing nut.
I normally just grab a handful of brake lever, which makes the caliper center itself. Keep the lever pulled and tighten the nut. This way it doesn't tilt as you tighten.

Tutorial: http://www.parktool.com/repair/readhowto.asp?id=20