The big green pumpkin crawbug(bottom right) in the picture is rigged with a gamakatsu jobee finesse hook. Rigged 1/4 inch in the tail with the hook point sticking out the head and barb still buried in the plastic to further prevent hang ups. I use the gamakatsu's(brown, black) or the slider jigheads(black, orange, red) pictured in the brown box.
How you work them would depend a lot on where you were using them. Rivers seem to have endless options with seams, riffles and the like whereas in lakes substrate becomes an issue and I'd look for rocky sections. I'd find some sort of incline and cast towards it, be it shoreline or submerged rock hump, and bring the bait slowly down the slope. With the crawdads I always try and fish them starting shallow and ending deep. Again slow is the key.