Fishing with artifical craw fish?

i have never fished with artificial crawfish. i have used live ones though. i have watched tv shows that showed the fisherman was tearing up the b with craw fish lures and i was in b pro shop and they demonstrated the lure and the b wouldn't even leave it alone. my question is what do yall think is the best way to fish the crawfish lure. oh yea..i picked up a b pro shop weedless football jig to go with it. that is what the guy at b pro was using a few week ago so i picked it up. if any of yall have any tips or techniques that would help me out. i am going to a river that is supposed to have a lot of lilly pads and gr cover if that changes the techniques any. thanks and good fishin