#1
I am having trouble especially on these two particular intervals, I can't seem to tell them apart accurately and consistently;

What songs did you guys associate m7, and M7 descending when you learned them? Thanks!
#2
in min7, i think its just an relaxing sound, and you can hear the b7 and the b3 in harmony, its kinda soft.
in maj7 you can hear the 7th that wants to go up to the root.

One day you`re gonna wake up and you`ll be 30 years old and you won`t have done a damn thing with your life.
#3
If you can do it ascending just remember the pitches and sing the lower one then the higher one.