Watch the Introductions online guitar lesson by Mimi Fox from Flying Solo
Structuring successful intros has a lot to do with meshing your heart and mind together in a creative way. What a song means to you, how it makes you feel, what the lyrics say, all these are some of the ways to think about creating a good intro. If you want to create a sense of surprise in an intro you might use some unusual sounding chordal ideas that lead into the body of the piece and sneak up on the listener. Use your brain to come up with the musical data you choose, but let your heart dictate what your brain selects.