#1
i'm kinda new to theory and everything but, what scales are used in this song?
#3
I don't usually do this, but im feeling generous.

Glancing at the first few sections, E minor, E phrygian and E phrygian dominant they also played a natural 7th over B minor (I think, it was only a glance), implying B harmonic minor.

Also, just knowing what scales someone uses doesnt mean you will instantly be able to write songs just like them. Learn how to use them, you can start by analysing that song for a start.