To start learning Arven - Rainsong chords, delve into these chords sequence to get the song's feel: Db, E, Gb, Abm, B, Eb, Abm, Ebm, E, Abm, Gb and E. For a smooth transition, initiate your practice at 67 BPM and gradually match the song's pace of 135 BPM. Adjust the capo based on your vocal range and chord preference, keeping the song's key of Ab Minor in mind.