Watch the Variations online guitar lesson by Brad Carlton from Guitar Lab: Boogie-Woogie
The kick on the "and of 4" can involve many variations of structures. I will give you 19 just to get you started. We will be in the key of E and we'll be playing over both straight and shuffle feels. This is a big lesson, so take your time and work through each of the tabbed examples. You can play them as written or edit the number of strings you play.