To learn Cass Phang - Wan Quan Yin Ni chords, your first step should be understanding these chords - Cm, F, Bb, Cm, Bb, Gm, Cm, Eb and Bb in sequence. To master the tempo, it's wise to start at 67 BPM before aiming for the song's 135 BPM. Given the song's key of Bb Major, adjust the capo to align with your vocal range and chord preference.