Watch the Chicken Pickin': Rhythm 2 online guitar lesson by Joe Dalton from Big Twang
Variations are always fun. Chorus two is a more driving and melodic part.
Listen to Elvis Presley's "That's Alright Mama" or Merle Haggard's "Workin' Man's Blues". On chorus three make certain the chords are played staccato. Playing staccato means separating the sound or detached. The opposite would be legato or attached. Keep the chords short and punchy.