In episode 5 of Orvis Fly Fishing GuideModerator Tom Rosenbauer explains in detail all the basics you need to know. Watch this video to learn why trout eat bats, which streamers to choose and why, which fly line to choose and more! You can watch all episodes on Amazon Prime.
And if you want even more guidance, check them out Orvis Fly Fishing Learning Centerwhich contains tons of videos, articles and animations to help you get ahead as an angler, no matter where you start.