For a generic blues progression on guitar, try D7 (count 4) A7 (count 4) D7 (count 8) A7 (count 8) A7 (count 8) E7 (count 4) A7 (count 4) D7(count 8) and repeat
D7 (count 4) A7 (count 4) D7 (count 8) A7 (count 8) A7 (count 8) E7 (count 4) A7 (count 4) D7(count 8) and repeat