To learn Tsai Ching - Decision chords, your first step should be understanding these chords - Bbm, Eb, Db, Ab, Eb, Ab, Fm, Cm, Db and Eb in sequence. I suggest starting at a calm pace of 37 BPM, and as you gain confidence, approach the song's BPM of 74. With the song's key of Ab Major, set your capo to fit your vocal range and chord choice.