To start learning Taemin - Ace chords, build your understanding on these basic chords - Db, Ab, E, Abm, Dbm, E, Ebm, E and Abm in sequence. A strategic approach would be to train at 56 BPM initially, and then accelerate to the song's tempo of 112. Considering your vocal pitch and chord choices, adjust the capo in accordance with the key: B Major.