You can find the Blues Shuffle in songs, like e.g.. "Crossroads", "Pride & Joy", "Before you accuse me" and many other classic Bluessongs. Mostly only 2 strings are played at the same time. On the first frets you can play the most simple Shuffles for the chords E, A and D and B. Practices them individually and also one behind the other!
Blueslessons.net - Shuffle Rhythms
For Shuffles on other frets and in other keys you need some more stretching in your fingers.
But with some pracice you can do that without bigger problems.
Blueslessons.net - Shuffle in A
A 12-Bar-Blues Chords: I = A IV = D V = E
Blueslessons.net - Shuffle in D
12-Bar-Blues Chords I = D IV = G V = A
BluesLesson.net Ebook - "Easy to learn Blues Guitar"
Learn to play Blues the easy way
This guitar course (about 70 pages) is especially written for people who are quite new to playing guitar.
Here you will find all you need to learn how to play the Blues:
* All beginner lessons are included in this ebook!
* You start from the first 12-bar-Blues to your first Blues solo licks.
* You´ll learn about Blues chords, the Blues scale, bendings, vibratos, slide guitar and much more!