I just started getting into it. Crowbusters.com is a great resource to learn from.

I've already got: decoys, shells, preymaster call with crow card. It's a blast to shoot crows. I had a harder time finding turkeys, so I turned to the million plus crows I kept seeing. I just use my turkey benelli supernova shotgun and my blind. You have to be careful, because crow hunting is addictive and can add up quick.