Great song. You can use standard tuning, but sounds better with double drop D tuning.

Chords: DADGBD
D5      000230
D7      000210
F       x3321x
C       x3201x
Gm      555333
Asus4   x02230


Verse:  D5 - D7 - F - C (Hear the song to get it right)

Chorus: Gm - C - Gm - C - Gm - C - Asus4

Outro: 
 
D---3---5---2---3---0---2-------0--|
B---------------------------1------|
G-2---2---2---2---2---2---2---2----|
D----------------------------------|
A----------------------------------|
D----------------------------------|

That's all.