#1
the trakcs I am looknig at jammin to say key of c,d,e,g or whatever. I want to use the blues scale over these tracks so does that mean i have to use Am blues scale with the C jammin track or can i just use the C blues scale?
Im not sure if the key is major or minor
#2
i think you should the Am blues scale but it depends whether it is major or minor

I suggest just listening to the tracks and see if they sound happy or sad
the first chord of the progression is important, if that one sounds minor then the song is usually minor

hope this helps