Here are some lessons in MP3 and PDF.

There are about a dozen lessons I've put up here. Everything from basic boogie stuff with walking bass finger picking with alternating thumb bass. A lot of stuff to help you gain Thumb/Finger(s) independence.  

There is also a basic intro lesson for bottle neck slide which covers the two popular tunings.  

So, actually quite a bit of study. In a way it is a short version of my book "Thumpin' Thumb And Fiery Fingers" The Blues Guitar Book.  

Not all just guitar or just "Blues" .(A bit of theory "light" thrown in there.