The four-chord pattern in the intro is Bm/Am/C/D. You strum each one a couple times, 
listen to the recording to get the rhythm. Here are the voicings:

     Bm   Am   C    D
e----7----5-----------------|
B----7----5----5----7-------|
G----7----5----5----7-------|
D--------------5----7-------|
A---------------------------|
E---------------------------|

Next intro segment:

e-----------------------------------------------------------------|
B----3-3-3-3------------------------------------------------------|
G----2-2-2-2---4^2^0----------2-2-2-2---------------------4-------|
D----0-0-0-0---------4^2^0----2-2-2-2----4^2^0------------4-------|
A-----------------------------0-0-0-0-----------3^2^0-----2-------|
E-----------------------------------------------------------------|


e----7----5-----------------|
B----7----5----5----7-------|
G----7----5----5----7-------|
D--------------5----7-------|
A---------------------------|
E---------------------------|