Q: How do I authorize my new MacBook Pro to play music and movies already purchased with my home OS X?

Greetings Melvinrck,

Thanks for using the Apple Support Communities!

Congratulations on your new MacBook Pro! I understand that you would like to authorize this new computer to play purchases from iTunes. To complete this task, please follow the steps outlined in the following article. 

Authorize your computer in iTunes - Apple Support

Cheers!