learn the blues scale (its basically the minor pentatonic with an added note or two)
learn the "BB King Box" and Hybrid Scale
buy a book or search for blues licks
buying a book is your best bet, if not try searching stuff on google. check out ultimate-guitar.com and some other good guitar sites. u can also try searching for e-books. what you wanna do is get the blues scale down, and just play blues licks over and over again. blues licks involve a lot of hammer ons and pull-offs and bends, so practise those as well. the most important thing though is getting the feel of playing the blues.
also try looking up tabs for good blues guitarists such as BB King, and learn to play their solos and licks. it may take a while, but you'll learn a lot.
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