This intro is simple and is the same throughout the whole song.. Only the rythm/
strumming changes...

Strum:
D: Down
U: Up
Intro:   Am           Em         F           Am       Em
Tab:
Strum: D  U  D     D  U  D    D  U  D     D  U  D  D  D  U  D
  e|------------------------------------------------------------------------|
  B|---1--1--1----------------1--1--1-----1--1--1---------------------------|
  G|---2--2--2----------------2--2--2-----2--2--2---------------------------|
  D|---2--2--2-----2--2--2----3--3--3-----2--2--2--2--2--2--2---------------|
  A|---------------2--2--2-------------------------2--2--2--2---------------|
  E|------------------------------------------------------------------------|



You can figure out the rest!