#1
what key and scale would this be and what else would sound nice with it (punk genre)

DM C5 A5 A/5+ F5
#2
It's in the key of D major (sort of, it's D mixolydian with a chromatic F, but D is the closest match). You would probably use the D minor pentatonic, D major pentatonic (just not over F), and D blues scales with it.