Breathing is the crux of it all. And let the engineer raise the volume on your channel. NEVER SCREAM. You don't want to lose your voice to glottal fry! Screaming through your range is not a good thing. The last thing you want is some teacher just teaching you how to make the effectiveness of your bad technique improve!
You want to start simple.
Basic technique is breathing
add pitch to the breath.
then work on vowels and patterns, then words
Repeat as desired.
Enjoy.
Singing serves us all