If you are going to work wood, you need a chisel. The size and type of chisel you need depends on what you want to build. There are several different kinds of chisels including, bevel edge or bench chisels, mortise chisels, paring chisels, and firmer chisels. If you're not sure where to start, just grab a 3/4 in. bevel edge chisel (and learn how to sharpen it).