1. Take your favorite light spinning rod capable of handling 4-6 lb. line.
2. Tie on a 1/32 or 1/16 oz. jig (marabou, plastic, or hair) in chartreuse or white.
3. Cast, count down to the depth you expect the crappie to be, and retrieve slowly.
That's the method I've used for about 30 years now. Works for me!