Take a hook, put it in your vice, make sure you have a rotary vice.
Tie in some eyes.
I like to wrap a bit of flashy stuf around the front part of the shank, or take colored tying thread in the color you want. Then put on some nice drops of hot glue on the colored part and dumbell eyes.
Now the best trick I know is take a lighter and hold it far underneath the fly. Start rotating the vice and the heat of the lighter makes the hotlgue melt into a drop shape. When it's the shape I want I just let the fly drop in some ice cold water or my beer.
After you tied a bulk of body's, you tie in the feather/hairy stuff, don't do that earlier, cause the heat of the lighter will burn/damage all the hairy/feathery things.