Yeah, I really want to take the easy way out and joke the hell out of Kirk Hammet's playing, but how about some real advice? If I were you, I'd learn the solos to "Enter Sandman" and "One" then take a few of the basic ideas from each and form your own riffs. Also, as has been mentioned before, get a distortion pedal and a whammy bar (preferably a floyd Rose since you'll be abusing it like Hammet does, don't want to go out of tune do you?).