system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 If the chord progression number system is i - II - iii - iv - V - VI - VII and your first chord is C minor, how do you determine what chord II and so forth will be? Also, how do you determine which order to play them?
gpt
>ELI5 If the chord progression number system is i - II - iii - iv - V - VI - VII and your first chord is C minor, how do you determine what chord II and so forth will be? 

The numbers indicate the scale degree. i is the first note of the scale, ii is the second, etc. Which means you have to know the notes of the scale. Maybe you understand that now from other responses. 

>Also, how do you determine which order to play them?

You play them in the order the song requires. Or if you're writing a song yourself, you order them how you want to get a particular sound. There are many possible chord progressions.