Tips for a Guitar beginner

Hi, I'm a complete beginner when it comes to music. I've been listening to metal for over 10 years and I've finally decided to learn how to play guitar. I have a couple of questions that I haven't been able to figure out from YouTube videos alone.

First, my amplifier feels like a mystery to me. How do I know which settings to use for each song? No matter how well I play, if the tone doesn't match the original it never sounds right.

Second, I'd love to know what resources I should use to learn metal guitar. Every YouTube video seems to prioritize different things, and after watching so many of them I end up more confused than when I started.

Thanks in advance for your help.