Watch the Tell Story/Tell Me - 3 online guitar lesson by Richard Kiser from Gospel Fingerstyle Guitar
The Intro consists of only two chords that will be fretted on the left hand, the first is an "Eadd9", the second is "Esus2" This is achieved simply by moving your middle and index finger up one half step as you keep your pinky on the 4th string 4th fret. The magic happens with the right hand on this intro. Your right thumb will start by playing the 6th, 5th, and 4th string, and as the tremolo begins your thumb will play; 6,5,4,3,2,3,2,3 then change the chord on the left hand and repeat the secquence. As you play this with your thumb, the tremolo is played on the 1st string by plucking consistantly with your ring, middle, and index finger as you let the note sustain. You can practice this exercise in virtually any chord. The main thing to focus on is getting your three fingers to play in sync. There is where the practice comes in.