Hi Oble sir,
There are tons of materials to start with:
1. Tinker with blues, minor, major pentatonic scales . I think you get the drift; you play metal. Slow it up a bit.
2. Get the 12 bar, I-IV-V relationship playing in your head. Once you get this, you go to the next step.
3. Play directly to an amp. Get the feel of of just the axe and the amp. Fender Bassman is the best!
4. I suggest listen to and sample blues from different eras; delta, chicago, even ragtime.
5. Here are some artists that'll help you get a head start. Eric Clapton - cream and derek and the dominos materials. Muddy Waters. B.B. King. Chuck Berry. Hendrix (Try Red house, which was also done by Eric Johnson). Jimmy Page / Led Zeppelin (Can't quit you baby)... Stevie Ray Vaughan / Jimi Hendrix (Voodoo Chile).
Blues is a "feel" music. Just squeeze and feel.
Hope this helps