First, review the major scale rule in C. Now, play C major, except, start on the 6th. Listen: you are playing A (natural) minor. Now, lets look at the natural minor scale rule in the key of C.
Refer to: http://www.musictheory.net/lessons/22
Natural Minor in the key of C
C D Eb F G Ab Bb C
t 1/2t t t 1/2t t t
Harmonic Minor in the key of C (Raise 7th note 1/2 step to B.)
C D Eb F G Ab B C
t 1/2t t t 1/2t 1 1/2 t 1/2t
Melodic Minor in the key of C (Raise 6th and 7th 1/2 step to A and B.)
C D Eb F G A B C
t 1/2t t t t t 1/2t
Minor Pentatonic in the key of C
C D Eb F G Ab Bb C
t 1/2t t t 1/2t t t
Minor Hexatonic Blues in the key of C (Ab has disappeared)
C D Eb F Gb G Bb C
t 1/2t t 1/2t 1/2t t t
Refer to: http://www.musictheory.net/lessons/22
Natural Minor in the key of C
C D Eb F G Ab Bb C
t 1/2t t t 1/2t t t
Harmonic Minor in the key of C (Raise 7th note 1/2 step to B.)
C D Eb F G Ab B C
t 1/2t t t 1/2t 1 1/2 t 1/2t
Melodic Minor in the key of C (Raise 6th and 7th 1/2 step to A and B.)
C D Eb F G A B C
t 1/2t t t t t 1/2t
Minor Pentatonic in the key of C
C D Eb F G Ab Bb C
t 1/2t t t 1/2t t t
Minor Hexatonic Blues in the key of C (Ab has disappeared)
C D Eb F Gb G Bb C
t 1/2t t 1/2t 1/2t t t