Honestly, some of the tabs I have seen for this are just ridiculous. 

Here is a non-crazy version of this tab, that actually sounds correct.
Breaks denote the variations. Listen and play along and you will hear them.

E|----------------------|-------------------|---------------------------  
B|----3-----------------|----3--------------|-----3---------------------
G|------2---------------|------2------------|-------2------------2~-----
D|--------2---5----7----|--------2---5---7~-|----------2----5-----2~----
A|--2-----------5----7--|---2---------5-----|---2-----------5-----------
E|----------------------|-------------------|---------------------------

         MAIN                 II                III

Thats it thats all.