ok so ive been playing guitar now for a while like 2 years i can play almost anything you through at me but i cant write becuase i dont know what structure to use to write metal riffs which is my style of music like i can write the riff just i have no idea what chords go with it nor where i can go from the note that im in like lets say im playing my riff in A minor i dont know if there is like a certain pattern you take for making the song go where you want it to im dedicated to learning but i just need a little help sometimes so please anyone who can give me a good answer i would really appreciate it