It needs a lo of practice my friend , you have to be really careful cause it can certainly damage your voice , just remember in the concert try to get 1 min of rest before starting the next song , the vocal chords are muscles and they are really sensitive , they cant take too much pressure so try to know what you r up to before starting songs.
To put it in perspective, overusing the voice even with normal singing can eventually damage it, and screaming (even when done 'correctly') speeds up that process tenfold. I'm not knocking the style, I just advise those interested that they have to be really serious about it, and willing to sacrifice the quality of their regular voice, probably make routine doctor visits, and go on prolonged vocal rests.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.