you say you dont care what you catch, as long as it is fair size. I have used a public fishing pier near my home to catch some great catfish. Those flatheads will give you the best fight of anything in that lake. If you are going to fish for them, you might want to make sure you have some sturdy equiptment. To catch the flatheads, you need to catch a bream about 3-6inches, clip one fin off one side of the fish, tail hook it and cast it out. If the dock is high off of the water, this could cause a problem trying to land the fish, but I have managed a 38 lber with another person and a net. If you dont have any luck with live bream, catch a small one, cut the head off and sling it out there, the body of the fish also makes a nice bait, but make sure your hook is in the bait well for a guarenteed hook up. I love using this method, you can catch a fish that is 3lbs or one that is 80lbs, good luck, if you get a bite,,,, VERY tight lines ;D
PS. You can EASILY lose your rod to the drink if you get a bite, I have seen many shot into deeper water. Use of a rodholder isn't optium IMO because most of the time the tension will snap the line when the fish takes off. either that or your pole... good luck!!!!