Key of D
D A Bm F#m G D G A
Count 4 for each chord so; D 2 3 4 A 2 3 4 and so on.
Next is a melody. so what scale to play? Grab your circle of fifths chart.
Below same info circle of fifth only flat
D string lets start there. D scale the next chart find D chord horizontal line
This song is key of D so any string will work just play the D scale and every note will sound great, you can’t hit a bad note, unless you play the wrong fret in the scale. so, putting a song together…chord progression(circle of fifths) and melody (scale played at random) perhaps triads and for bass sound play power chords and for drum percussion slap body of guitar or palm mute