First determine the key of his song, such as a song in G key, and then you can start the song with G chord, and then move the chord of the whole song. Generally, it can be compared with 1645 in G key. Then, if you are a band, you can make an introduction (prelude), with G as the starting note and other notes as the passing notes, so that another guitar can also use G chords at the corresponding time. Two guitars will stick together when you go in. As for the bass, it's a chord, and the root sound is also a G sound. This is the simplest arrangement of the band. If you need a score, I can help you.