Add a rubber worm or a large rubber scampi to increases the jig's effectiveness. Thread a piece of herring, octopus or halibut skin on the hook for smell and you'vecreated one of the most effective lures available. When it comes to color, several work, but nothing beats a fluorescent red tail that imitates a crab or octopus. Flat metal baitfish-imitating jigs like Pt. Wilson Darts, Zzingers, Spinnows, and Luhr Jensen's jumbo Crippled Herring all work well.
Size depends on depth, current and wind.
Try to use the lightest jig that stays close to vertical and on the bottom. This allows you to slowly and steadily yo-yo the jig up and down. An occasional pause followed by reeling twenty feet, then free-spooling to the bottom will draw strikes when nothing else will. Color depends on the angler and fish. Choose one, fish with it and see if the fish respond.