How can I set up a store appointment for a specialist
To transfer all content on an older Macbook Air to my new one.
MacBook Air 13″, OS X 10.10
You can do it without a specialist, if you choose.
When you open up a new Mac, there is an option to restore from the latest backup, on your old Mac.
Move content to a new Mac - Apple Support
If you choose not to do it on your own, Here you go!
Genius Bar Reservation and Apple Support Options - Apple