So say I had a little melody going in the key of C minor and I wanted to find the chords for it (C minor). Is this right:

C Minor:
C D D# F G G# A# C


C D# G -- C Minor (i)
D F G# -- D Diminished (iio)
D# G A# -- D# Major (III)
F G# C -- F Minor (iv)
G A# D -- G Minor (v)
G# C D# -- G# Major (VI)
A# D F -- A# Major (VII)


Thus my C minor chords are: Cm, Ddim, D#maj, Fm, Gm, G#maj, and A#maj

Did I apply the formula correctly thus far?

Aside from playing around with these chords (which I fully plan on doing), can you give me any pointers of some good progressions to use that will fit my melody? The melody itself has a dark, brooding, and solemn quality about it if that helps.

What if instead of three notes for chord construction I used four, such as:

C D# G A#
D F G# C
D# G A# D
F G# C D#
G A# D F
G# C D# G
A# D F G#


Is this a legal maneuvre so to speak? All I did was skip another note because I noticed I had room before I got to the octave again. Do these chords have names?