One resource Ben doesn’t mention, but you should know about, are the Orvis Fly Fishing Reports and Conditions page. It will help you avoid heading for a piece of water that might be blown out, for instance.
Here’s another great how-to video from Ben Sittig, a.k.a Huge Fly Fisherman, addresses a topic that has become quite contentious on the Interwebs in recent years: How to go about finding new places to cast a fly. Every day on Facebook, you can see folks asking for advice on where to go. HFF says, “Stop asking and figure it out for yourself.” But he doesn’t stop there; he goes on to suggest several good methods for finding spots of your own. The one caveat is that you must be willing to fail, to drive and or hike to a spot that simply doesn’t pan out. That’s where the real spirit of adventure comes into play.