There are lots of posts here about jig fishing. You can search the site by putting in the word jigs and hitting enter and you should get a lot of information. I love to cast a jig. Just tie a lead head jig on...hint(roadrunner head) and put a curly tail jig body on it and walah...you have a fish catching rig. Oh yea, you need to buy some crappie nibbles. Buy the heads and the crappie nibbles at wal-mart or any sporting goods store.You can fish a jig under a cork the same way you do with the minnow. I don't buy minnows not that they don't work but I usually can catch fish w/o them. Don't quit buying minnows however if they are working...stick with what works and ease into some alternate techniques. The key is to catch fish and have a good time. When you start catching fish on minnows try to cast a jig in there and catch a fish on that. You KNOW the fish are there so you can play with it a little to get accustomed to how THEY want it. Sometines we try to tell the fish how it's going to be. Works sometimes but the guys that are real good at CATCHING learn how to present the baits that the fish want.
Hope this helps a little. I could write a two page posts on jig fishing but most of it has been said already in other posts. Look em' up if you don't see what you want ask again.