HOW DO I IDENTIFY INTERVALS????

Question

I need to know major, minor, augmented, diminished, and perfect.
so here is what I kind of understand so far:
PU: 0 half steps
P4: 5 half steps
P5: 7 half steps
P8: 12 half steps,
and for any one of these to be diminished, there needs to be one less half step, and for them to be augmented, there needs to be one more half step. however, I am utterly lost on the identification of minor vs diminished vs augmented in the Majors.
HELP ME PLEASE