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There are 2 basic types of flies every beginner should have,Imitation Patterns - Most dry fly patterns will try to imitate the fly based on shape, size, and color. These flies are usually mayfly, stonefly, and caddis fly patterns. Dark color flies are used in cooler weather (dark color absorbs more sunlight for heat) while lighter color flies are used in the heat. The most common imitation dry flies are:Elk Hair Caddis Parachute Adams Stone FlyMay FlyGrasshoppersAnts Attractor Patterns – Attractor patterns do not necessary try to imitate a specific insect. They are generic patterns that have similar size, shape, and colors of various insects. Attractor patterns can be very affective. The most common attractor dry flies are:StimulatorRoyal Wulffs Royal Coachman
I personally think 6 is on the heavy side for any trout. I haul in a lot of silvers with my 6, but it will work. All the flies listed are good, but the more area you fish the more flies you are going to find you need. Seems like every area I fish has a favorite spring, summer, fall fly. I didn't see any leeches listed above. That is definitely a must have. Throw in a couple San Juan worms also. When you are hauling in the fish, just tell everyone it is a pink chironomid.
As mentioned caddis, parachute adams, griffiths gnat, hares ear and I really like soft hackles when fishing mountain lakes
Which brings to mind, I dont know if you are a "Trout Snob" or not, but a 6 weight can be fun for Bass fishing.