That is a very loaded question lol. As far as size of the lure... match the fish to the size of current size of their food. An example would be that black crappie usually favor smaller shad/minnows than white crappie so go down to the smaller size plastic if you are targeting blacks. Later in the year their food has grown bigger so the larger plastic may be needed to simulate the current food size.
Sent from my SM-G960U using Crappie.com Fishing mobile app