Ford Fender, Doc Shelton, Beer Cans, or any other flasher set of your choice. Then, 3 - 4 feet of leader. A Wedding Ring spinner (pink beads or 1/2 green and 1/2 black beads), tipped w/ 1/2 a worm. My other "go to", is the same flasher set; but with a brass colored Little Cleo spoon. Let your gear out about 100' behind your boat.
And this time of year, the fish are active on / near the surface...so, no weight should be needed. But, if you need to get deeper...a 1/2 or 1 oz. banana weight inline, will do the trick.
I also echo TS's suggestion:
"In my pontoon i like to troll flies with a spinning rod. Don't have to troll fast." This works just as well in a float tube too. With a spin rod, just use a torpedo bobber and about 4 - 5' of leader to the fly. Wooly Buggers, and Teeny Nymphs are also deadly w/ this method. The fish like Olive Green, Black, and sometimes Brown...in sizes 8-10 generally.