I would gladly help you, but you prefered dubstep, that I can't help you with. If you ever happen to change your mind, I can happily try to do some metal music for you **if you wonder what kind of music, you can just click on my youtube thingy and see it for yourself :)**
Indeed he uses some effects but I can't exactly tell what they are and with which program they are done. But I do know that he records (not sure if edits) with windows movie maker. But he may use some editing programs like Sony Vegas.