The arrangement of these changes is in a very common sequence used a lot with early rock. It is known as '12bar blues' and brings back memories of StatusQuo / Elvis / The Blues Brothers.
Letters above the tab are the chords behind the riff. Notice there's 12 of them.
Vital tip: the frets used are all between second and fifth, that's a span of 4 frets and you've got 4 fingers available. Check out my practice tip The Mexican Wave where you use a finger-per-fret and never move your hand.
A A A A D D
E [----------------- ----------------- -----------------
B [----------------- ----------------- -----------------
G [----------------- ----------------- -----2-4-5-4-2---
D [-----2-4-5-4-2--- -----2-4-5-4-2--- -0-4-----------4-
A [-0-4-----------4- -0-4-----------4- -----------------
E [----------------- ----------------- -----------------
A A E D A A
E [----------------- ----------------- -----------------
B [----------------- ----------------- -----------------
G [----------------- ----------------- -----------------
D [-----2-4-5-4-2--- -2-4-5-4-2-0----- -----2-4-5-4-2---
A [-0-4-----------4- -------------4-2- -0-4-----------4-
E [----------------- ----------------- -----------------