It's drop D tuning.

Part one of Intro:
e|-----------------------------------|
B|-----------------------------------|
G|-----------------------------------|
D|-----------------------------------|
A|-----------------------------------|
D|-00h3h4p3-00h3h4h5-00h3h4p3-33-33--|[x2]

Part two of Intro:
e|---------------------------------------------|
B|---------------------------------------------|
G|---------------------------------------------|
D|-00\-3\-4\-3--00\-3\-4\-5--00\-3\-4\-3--3-3--|
A|-00\-3\-4\-3--00\-3\-4\-5--00\-3\-4\-3--3-3--|
D|-00\-3\-4\-3--00\-3\-4\-5--00\-3\-4\-3--3-3--|[x2]


Prechours:
e------------------------|
B------------------------|
G------------------------|
D-3-0-3-0-3-0-3~---------|
A-3-0-3-0-3-0-3~---------|
D-3-0-3-0-3-0-3~---------|[x4]

Chours:
e---------------------------|
B---------------------------|
G---------------------------|
D-3~-0~--3--5--3~-0~--------|
A-3~-0~--3--5--3~-0~--------|
D-3~-0~--3--5--3~-0~--------|

AFTER THAT DO PART TWO OF THE INTRO.

\ =slide
~ =let ring
h =hammer on
p =pull off

I think thats it for the intro and chorus. Good luck!