a rely good book to get would be fly fishing for the compleat idiot by Micheal Rutter
dry flies are heavily hackled and are used when you can see a hatch or flies flying around .they are fished on the surface . fish eating these probably break the surface rise is usually jumping out of the water .
wet flys are sparsely hackled two wraps the rise may be notid buy small rings from fish sucking in the fly or buy a dorsal fin .
nymphs are the larve or nymph stage of insects . and a good place to start if you don't see active fish . becuse 80 percent of the trouts diet is consumed under the surface.
look for part of a tail as fish eat these off the bottom usually
streamers are minnow imitations big fish eat small fish .