Like maflynn says above...
Get an external drive.
Back up the old Studio to the drive.
(You should always have a backup, anyway!)
When the new Mac comes, take it out of the box and set it up on the table.
Connect the backup drive.
Press the power-on button for the first time.
Begin setup. Setup assistant will ask if you wish to migrate from another Mac or drive. YES, you do, so...
... point the way to the backup and give SA a moment to "digest" things.
SA will present you with a list of stuff that can be migrated. I suggest you just accept the defaults (which is "everything").
Let setup assistant do its job.
When done, you should see your new login screen, which will look pretty much like the older one.
So... log in and "look around"...