This guide assumes you're able to read standard treble clef/bass clef music notation and are comfortable with key signatures.
Step one with doing a Mandachord transcription of a song is to figure out how to play the song, in its original key, on a "general" musical instrument.
If the only musical instrument you have is the Mandachord itself then you're really working blind. You might be able to make something happen, but it's going to be a struggle most of the time. You