Depends on what type of blues you want to play... real basic 3-chord or more of a jazz-blues. The real, mind-numbingly simple, 3-chord blues are as follows: root for 4 bars 4th for 2 bars root for 2 bars 5th for a bar 4th for a bar root for 2 bars So, F blues in the above format would be: F7, F7, F7, F7, Bb7, Bb7, F7, F7, C7, Bb7, F7, F7 A more jazz-type blues would be root for 1 bar 4th for 1 bar root for 2 bars 4th for 2 bars root for a bar 6th for a bar 2nd for a bar 5th for a bar root 2 beats/6th 2 beats 2nd 2 beats/5th 2 beats Blues in F again: F7, Bb7, F7, F7, Bb7, Bb7, F7, D7, G7, C7, F7|D7, G7|C7 There are of course TONS of alternate chord choices you can make... this is an EXTREMELY generic guideline.
or you could try (my favorite) 1 3 5 6 7 6 5 3 1 then on bflat 1 3 5 6 7 6 5 3 1 then repeat on f then b flat 1 3 5 6 then on c 1 3 5 6