Improvise out of your old friend the minor pentatonic scale just like like before, just add in those extra notes for added color. Again, your are just adding to something that you are already familiar with, rather that thinking of a whole new set of notes.
One thing to keep in mind is that these added notes only work in certain situations in which a minor scale sound good. If you are playing a major blues, and are used to playing minor pentatonic licks over that progression, DO NOT add these notes. It will not sound good. If you are playing a minor progression (Stairway to Heaven - Led Zeppelin, Smooth - Santana) this will sound great. It is important to learn as much as you can about music theory to help you understand what scales will work in different situation. There is of course the old fashion way...use your ear.
Practice playing with an Am background.
Minor scale soloing on the guitar
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