Very thank you for the comment !!!!!
To answer a little bit on how I proceed :
Everything is done on my computer for the sound, and I play the instruments Keyboards and guitare.
First thing is to find a rythm if you want the music to be with a heavy riff.
I put first the drum patterns taken from the rythm boxes of my studio software.
For the sound of the guitars, I use the VST effects of this same software (Magix Samplitude). At this time I recorded this song, I didn't used the synthetiezrs from Samplitude, I used the synthetizers Yamaha W7 with the sound reprogrammed