Despite pandaface's post reading like a 14 year old wrote it, it is accurate. The Razormane, a little walk south of Camp Tuarajo, drop tons of Wool. These are they guys that drop the quest weapons for the quest
Weapons of Choice. These weapons drop even if you do not have the quest, and can sell to the vendor for a fair price (for their level.)
Razormane's in that area range from levels 22 to 25. This has always been my favourite Horde grinding spot starting from 23 to 27ish.
Don't worry about Tailoring too much; silk is around the corner. Silk drops for nearly 20 levels. On my server, Twisting Nether, a newer RP/PvP realm, silk goes for 35s-65s per stack, and Wool sells for 1g 20s to 1g 75s per stack.
Silk also drops from the Scarlot Monistary like nobody's business. This is one of the most commonly farmed instances.