Where they are
Bass like to ambush their prey, so they usually hide near submerged trees, stumps and vegetation. Laregemouth bass, which prefer warmer water, like ponds and other still water. Smallmouth bass like cooler water. Bass usually stay in shallower depths, though smallmouth stay in deeper water until they come up to feed. Bass also prefer shadows to direct sun. When fishing for bass, look for spots that the bass would use for cover.
Gear
You don't need special rods to fly fish for bass; a six or nine-weight rod will do. Make your flies as realistic as possible as bass have very good vision and sense of taste. It's a good idea to wash your hand before tying your flies. Poppers and divers are popular flies for largemouth bass. Wooly Buggers and Red Squirrel Nymph flies work well for smallmouth. Because bass are attracted to movement, use deer hair to create bigger bugs.
Casting
Be quiet on the water and be patient. You don't have to launch your cast with a lot of force. Casting for bass can be done at shorter distances, say, between 20 and 50 feet. After casting, let the fly sink slowly and attract the bass' attention. To become effective, practice many different types of casts until each one is presented smoothly.