You might watch for the series on PBS about the blues. It was produced by Martin Scorse. It's hardly a complete history but it would give you a good overview of the history. Perhaps your local library has a copy. Good Luck.

And check out this link

http://www.dirtylinen.com/linen/special/bystate1.html

It a guide to whos playing where. I see that John Hammond Jr is plying in your town this Friday night- the 11th. If you enjoy the blues you should make an effort to see him.