If anything, don't listen to Metallica. Their old stuff is okay, but their new stuff is complete garbage. I'd suggest Megadeth for metal, Racer X for speed metal, Dethklok for melodic death metal, etc. Yngwie Malmsteen plays good neo-classical metal and MAB plays pretty good speed metal as well. Wouldn't recommend Dragonforce, you'd get bored of them quick. A lot of their stuff sounds the same and it's sped up. Also, if you really want to get involved in metal, come join MusicHub.