The first thing you need to do if you want to start a band is figure out which genre of metal you are going to dip your toe into: death or black? What's the difference, you ask? Ah, well, that is like asking the difference between a cadaver pregnant with a demon's child and a forest haunted with pedophilic Viking spirits. Like, duh.There's also some good stuff about how to dress, picking a band name, writing lyrics, and The Golden Girls.
If you decide to go the death metal route, ever-helpful Strong Bad has advice for you. If you go with black metal, I'm afraid you're on your own.