To jam and learn Flex - Luna chords, your primary focus should be mastering these chords sequence: Cm, Bb, Cm, Bb, Ab, Cm, Ab and Bb. To master the tempo, it's wise to start at 80 BPM before aiming for the song's 160 BPM. Given the song's key of Eb Major, adjust the capo to align with your vocal range and chord preference.