ok so i got a new seagate momentus 7200.4 500gb. i know to install it mechanically and everything but im not quite sure how to install/format everything once its installed. do i just put my osx dvd in? i would like to start fresh with this hard drive so its not cluttered with junk i don't need. but i would also like to copy over all my documents, music, and apps from my old hd. what is the best way to do this? btw i have an external caddy for my old drive.