Here I've added the steps of the scale which in traditional theory are expressed with Roman numerals. Also I've added the root chord of each mode at the end. These root chords or Triads are constructed by playing the I, III and V steps of the current mode. Once you get comfortable with all this is C Major then you can apply this knowledge to other keys like G Major, D, Major, etc... You can google the notes of all twelve keys and their pattern of white and black keys on the keyboard. It's really not all that hard once you get your head around it and you should be able to put your song together much easier afterward.
Step/Root note/ Modal name/Root chord (Triad)
I = C = Ionian (Natural Major) = C Major (C, E, G)
II = D = Dorian = D minor (D, F, A)
III = E = Phrygian = E minor (E, G, B)
IV = F = Lydian = F Major (F, A, C)
V = G = Mixolydian = G Major (G, B, D)
VI = A = Aeolian (Natural minor) = A minor (A, C, E)
VII = B = Locrian = B Diminished (B, D, F)
Cheers.