It is not quite clear to me what you are trying to do but I think you are transcribing or changing the progression to a minor key from a major. So, in C major the I and ii chords are C maj and D min. As 7th chords they'd be C Maj7 and D min7. All you need to do to get the correct chords in sequence in a major or minor key is look at the triads created by the scale, taking every other note in secession.
In any major key we start with the major scale (1, 2, 3, 4, 5, 6, 7, repeat) or (Do, Re, Mi, Fa, Sol, La, Ti, repeat).
The chords corresponding to each degree are:
I --- Maj --- (1, 3, 5)
ii --- min --- (2, 4, 6), which is a (1, b3, 5) relative to the ii
iii --- min --- (3, 5, 7) same as above rel to iii
IV --- Maj --- (4, 6, 8) which is a (1, 3, 5) relative to the IV
V --- Maj --- (5, 7, 9 or 2) same as above rel to V
vi --- min --- (6, 8, 10 or 3) minor (1, b3, 5) relative to the vi
viii --- dim --- (7, 9, 11) or (7, 2, 4) which is (1, b3, b5) relative to the vii
To get the chords in any minor key you can do the same with the minor scale or realize that the minor starts on the vii degree of its relative major scale. Hence the order of the chords in a minor key (built on the natural minor scale) are:
i --- min
ii --- dim
III --- Maj
iv --- min
v --- min
VI --- Maj
VII --- Maj
Notice that it's the same sequence but shifted. For a major key {Maj, min, min, Maj, Maj, min, dim} for minor {min, dim, Maj, min, min, Maj, Maj}. You get different chords using the harmonic or melodic minor scales.