I have my iTunes library on my 4 yr old dell, how do I convert the library to my new mac book pro?

Move iTunes Library from PC to MAC

http://www.macworld.com/article/146958/2010/03/move_itunes_windows_mac.html

BTW, this forum is for questions from people managing sites on iTunes U, Apple's service for colleges and universities to post educational material in the iTunes Store. Normally you will get the quickest and most applicable responses if you ask your questions in the general iTunes forums.

Regards.