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 .