I usually use 2 major strategies when fishing a grass flat. one is to cover water using the wind or trolling motor with a search bait like a swimjig, spinnerbait, square bill or paddle tail. The other is to hit specific targets like grass edges, depressions, and other boundaries. If I can identify a creek channel, or other contour no matter how slight, I'll spend some effort there. The lures used on the latter, in addition to the ones already mentioned, are t-rig plastics or jigs. As the water warms a buzzbait, popper, Sammy, or other topwaters can be really good at times. As always, I let the fish tell me what to do. A grass flat can fish quite differently from day to day, and sometimes hour to hour, so it pays to stay flexible.