Replying to Multi-MAC // iPod questions.

Ok, u guys are all waaay smarter than me and cool about this stuff, so I appreciate the help in advance.  I got a new iPod.  My original library is on my PC, desktop.  I want my main library to be on my MB pro.  How can I change this and transfer all songs from my iPod to my MB pro?  Also, I've got some movies from torrents and need to learn how to put them on the new pod, actually can't even get them imported to iTunes.  Thanks for helping the old guy (26).