Learn some OLD metallica,slayer and megadeth.Stuff from Ride the lightning/master of puppets,reign in blood/south of heaven,rust in peace/countdown to extinction albums.Learn any Iron maiden material.Yeah,all the stuff I listed is "intermediate" difficulty,but they're songs will equip you with an arsenal of techniques,will help begin shaping a style of your own and will familiarize you with the fretboard.Even if you dont play metal,it will give you an edge.