Listen more metal music. It is like learning new langguage. It takes time to understand the concept and how to use it. Since you are accoustic guitar player, i knew you are really good with your fingers, but this time you will be practising a lot using the pick and it is time for you to choose the right pick and the right way of using it. Get your palm muting works, listen to how metal music play their chords and lead scales and the skills. Oh, metal will work with sound effects especially distortions, feedback and blah blah blah blah. Remember, it is all more to mental adjustments and if you can think like a metal or rock person, you can play like a rock person. Hmmm... but it is great to be able to think like a musician where you can play all kinds of music genre and styles. Be a free thinker and that means free your mind from just one music concept. So, to begin with, look for metal music on the store be it original or pirate, at least you have the sample music and analyze how metal works. What kind of beat do they need? What kind of guitar effects and tones they need? Any echo or feedback effects? Any palm muting when playing the lead solo and the chords progression and listen to the riffs. It is all to your effort now and the benefits you are the one to gain.