Im pretty sure this is the correct intro for it

When you play the first section play the e string open 
each time you play the other
but stop when you get to section 2 & 3

Section 1

e|---------------------------------------| 
B|12-12-12-10-10-10-9-9-10-9-10-9-10-9-10| 
G|---------------------------------------| 
D|---------------------------------------| 
A|---------------------------------------| 
E|---------------------------------------| 

Section 2

e|-------------------------------------------------| 
B|12-12-12-10-10-10-9-9-10-9-10--9-10--9-10--9-10--| 
G|-----------------------------11----11----11----11| 
D|-------------------------------------------------| 
A|-------------------------------------------------| 
E|-------------------------------------------------| 

Section 3

e|-----------------------------------------------------
B|12-12-12-10-10-10-9-9-10-9-10--9-10-9-10--9-10-9-10--
G|-----------------------------11---------11---------11
D|-----------------------------------------------------
A|-----------------------------------------------------
E|-----------------------------------------------------


e|-----------------------------------------------------
B|10-10-10-10-10-10-10-10-12-12-12-12-12b--------------
G|-----------------------------------------------------
D|-----------------------------------------------------
A|-----------------------------------------------------
E|-----------------------------------------------------