I like to cast a small 1.5" YUM curl tail grub at crappie. I'd look for visible structure like laydown trees, standing timber, beaver piles, old fence rows boat docks, marinas (if not posted!), dams, bridges, ETC.
I'd also use my electronics to look for fish around brush under the surface. It may take a while to find brush on your electronics, just look for somthing that comes up off the bottom and see if there is fish hanging around it! It can be rather tedius looking for brush in deeper water but don't give up! Crappie like acsess to deep water so drop offs, points and creek ledges should get your attention first.
I use a 1/16 oz jighead with my curl tails. I'm not sure on color in your neck of the woods but any shade with chartreuse should do it. My favorite is black/chartreuse.
Here is a link for the curl tails.
Good luck!
http://www.lurenet.com/productdetail.aspx?id=ywc112