Verse -> G F
Chorus -> Bd F G

Im not sure how the picking goes, but this sounds like a good start..
          G             G             F             G
----------3-3-3---------3-3-3---------1-1-1---------3-3-3- | 
--------1-3-3-3-------1-3-3-3-------1-1-1-1-------1-3-3-3- | 
--0-0-3---------0-0-3---------0-0-3---2-2-2-0-0-3--------- | 
--------------------------------------3-3-3--------------- | 
----------2-2-2---------2-2-2---------3-3-3---------2-2-2- | 
----------3-3-3---------3-3-3---------1-1-1---------3-3-3- | 

Verse:
G
I left alone, my mind was blank
         F                                  G
I needed time to think, to get the memories from my mind

What did I see, can I believe
            F                                    G
That what I saw that night was real and not just fantasy

Just what I saw in my old dreams
           F                             G
Were the reflections of my woman staring back at me

'cause in my dreams, it's always there
         F                                      G
The evil face that twists my mind and brings me to despair

Chorus:
Bd      F                      G
Six six six, the number of the beast
Bd       F                      G
Hell and fire was spawned to be released


Torches blazed and sacred chants were praised
And as they start to cry, their hands held to the sky
And in the night, the fires burning bright
The ritual has begun, Satan's work is done

Six six six, the number of the beast
Sacrifice is going on tonight

I'm coming back, I will return
I will possess your body and I'll make you burn
'cause I have the fire, I have the force
I have the power to make my evil take its course