How you know which chords do you play, if you have just
a scale.
Example: key C(jonian mode): C D E F G A H C
chords: C,Cm7,C6,C7,C9,Csus4,C7sus4,C°7,Dm,Dm7,
Em,Em7,F,Fm7,F6,G,G7,G9
How get all this chords?

Please answer me.
thank you

My english is very bad so I'm sorry.