What you need to do is to be what I call monkey for a while. You know monkey see monkey do. Look around for others catching crappies and be friendly. Ask questions and just watch them. Don't get too close when they are getting fish, but you can fish around them as long as you respect their space. Local tackle shops are a great source of information. Just go and browse and ask questions. Get some jigs and hang around. You'll find people who are on the fish, and the owners/counter people also usually know a lot and are usually easy to talk to.
It would help if we knew where you were. We have agents everywhere! We can help you locate good spots to fish.