To start learning Marcy - Miss You chords, build your understanding on these basic chords - G, Cm, Bbm, Bb, Eb, Ab, Fm, Gm and Eb in sequence. I suggest starting at a calm pace of 39 BPM, and as you gain confidence, approach the song's BPM of 80. Considering your vocal pitch and chord choices, adjust the capo in accordance with the key: Eb Major.