Right or left-handed bows can shoot right or left wing feathers equally well. If you decide to use left wing feathers, then you need to use either a left helical or a straight clamp in your fletching jig. If right wing, then use either a right helical or straight clamp. A good, all around fletch would be a 5" RW or LW feather in a helical clamp of the same designation. If you shoot mainly targets, you might prefer 4" feathers, but 5" is good for both target points and broadheads.
A turkey has an equal number of RW and LW feathers, so it would be nice if shooters were divided 50/50 between them, but unfortunately it doesn't work out that way.