It's basic music theory. Get yourself a theory book and plod along with that. Let's see if I can remember how it goes.
The major chord C is CEG first interval 4 semitones second interval 3 semitones.
C minor would be CEbG. First interval 3 semitones, second interval 4 semitones
C augmented would be CEG# 4 semitones 4 semitones.
Cdiminished C Dim would be C EbGb 3 semitone 3 semitones
The seventh is the seventh note of the scale flattened.
So C7 is CEGBb. Cmin7 is CEbGBb
Cmaj7 would have an un flattened 7th so CEGB
CAug7 would be CEG#Bb
I've used C for each chord but Cminor isn't in the key of C major of course. A minor is the relative for C
I remember how confusing it can be when starting out. After a while you'll just hear and play them.
Try this exercise CGEB DFAC EGBD FACE GBDF ACEG BDFA.
(Cmaj7 Dmin7 Emin7 Fmaj7 G7 Amin7 Bdim7)
It was an exercise Kathy Stobbart gave me as a simple way of practicing all the chords in a given scale.
Once you've got it off in C and can hear the changes move around and try different keys. I start on C and go up in whole tones till I'm back at C. Your brain may turn to jelly before you get back to C.
Then when you see a chord written down you'll know where the ribs are to add your meat.
And you thought the sax was one note at a time