Welcome to the forum JerryW!
In the winter months target the deeper holes in the lake,and also you could try the inside/outside turns of depth changes.Pretty much anywhere there's structure.If fishing dark stained waters....try using jigs with flash(silver,gold and copper blades) and brightly colored jig heads...your whites,chartreus,and yellows can work best.
In the springtime target the north shores of your lake or anywhere there's mud.Using insect looking jigs/lures can be deadly.Flu-flu's are deadly either fished alone or tipped with a small minnow.Set your bobber at about a foot to 18 inches above your jig and move it up or down to locate the crappies.Most of the time you just need to cast near any kind of structure to locate them.Trees that have fallen into deeper water...docks,stumps,weeds,etc...but deeper water needs to be close by in order for the fish to use it for hiding or attacking their prey.Good luck....
Any more questions...just ask.:D