In each village, there are 4 spots to craft. One is a wholesale guild and anyone can join. The other three can only be joined by players who are in that class tree - so any scholar could join the scholar's workshop and any craftsman could join the craftsman's workshop but a craftsman can't join the scholar's workshop.
To find the 4 locations, open the map while you are in your home village. they will be located on your map and are usually behind a cellar door or are located in the back of some other building.
Within the city itself, the only workshop I know of is beneath the ironforge estate in North Qeynos. Anyone can craft there.
Edited, Tue Oct 11 12:20:37 2005 by OldBlueDragon