Another piece of good news is that blues guitar is fairly easy for some people to learn. Learning the techniques is the easy part. But learning the timing and phrasing is something that seems to come natural to some, while others have a harder time. If you're playing lead, you almost have to treat the guitar like a singer. Some of the best blues guitarists are great because of their ability to bend one note. The emotion you can get out of one bend is everything. There's actually an entire lesson about string bending on this site.

So I would start by opening the Scale Finder (top right of your screen), selecting the Blues scale, and learning the notes in a couple positions to start with. There are a bunch of free slow backing tracks on this site or on Youtube. Those should help bring out that blues guitarist who's hiding inside you. ;)

~Rusty