I also recently got a macbook pro, though to be honest I had no clue I'd want to (more seriously than before) get more serious with music.
So just to get what I've read straight...Logic Studio is just a DAW, and doesn't come with a spectacular library - dedicated sample libraries you save up for and are sold by different companies. However, not all sample libraries will transfer between DAW's due to license issues and file extensions? I'm a complete noob when it comes to digital music technology, bear with me...