When fishin for flatheads, you cant go wrong with live bait. Bluegill, creek chubs, and sometimes even shiners work well. I like to hook them above the dorsal fin, I make sure to put enough weight on the line to keep the fish on the bottom. Have the weight about a foot up the line from the bait so the bait can swim around a little and isn't flat on the bottom. Other baits that work great would be chicken livers, chicken hearts, and cut bait. I use these more than live bait but I catch mostly channel cats. You can catch flatheads off them too though.