If you purchase a new Macintosh computer from the Apple store, they will move the files from your old Macintosh laptop to your new laptop for you. At the time of purchase, you must sign up for the "one-to-one" program for $99, which includes one year of classes, then they will move the files for you. If you prefer to move your own files, you can go to the store and for little or no charge, they will clearly explain the process of moving all of your files.
If you would rather transfer the files yourself, without help from an Apple store technician, you can use an application called Migration Assistant. This application comes with your new laptop; it can be found in the Utilities folder:
HardDrive->Applications->Utilities->Migration Assistant. These two tutorials from the Apple Support website provide very good instructions: