If you want to play some blues sax, here is the basic blues progression, with roman numerals showing the chords.
I7 | I7 | I7 | I7
IV7 | IV7 | I7 | I7
V7 | IV7 | I7 | I7
In the key of C, that would be.
C7 C7 C7 C7
F7 F7 C7 C7
G7 F7 C7 C7
