I'm assuming by PC you mean that it's a Windows box? I imagine there's a 'printer sharing' feature in Windows that may or may not work with Apple's. If it's a Mac, then turning on Printer Sharing in the System Prefs on both machines will allow you to print to it.
For your music, it's easy to do if both machines have iTunes. On the 'PC,' turn sharing on within iTunes sharing preference and select the entire library to share. On the MPB, go to the same preference in iTunes and select 'look for shared libraries.'