Watch the I min7 IV7 Progression online guitar lesson by Frank Vignola from Inversion Excursion

Once you are completely comfortable with playing your triads and moving them cleanly to the next chord type, then move on to this section where we go through the A minor 7th and other extensions to the D dominant 7th and its respective substitutes. REMEMBER--When you see chord symbols that say A minor 7th or A minor 9th, think about the chord in its simplest form which is an A minor triad. With all the inversions and extended chords you know now, why would you limit yourself to one chord extension?
I take you through the inversions as we did in the previous segments then get into rhythmic patterns. Don't forget that once you feel comfortable with the minor 7th chord, move onto minor 9th's and the other chord extensions we have gone over. Check out the A minor 7th to D dominant 9th. You may notice that there is just one note that changes when using the D dominant 9 on four strings.
Enjoy this jam track and experiment, experiment, experiment. Create, create, create!!!!