Hi. My name is***** you for your question and the opportunity to assist.
From your computer log in to your Amazon account and open the account menu by clicking
Your Account under your name.
In the Digital Content section click Manage your Content and Devices.
Click Your Devices and make sure the new Kindle shows up there.
Then click Your Content
You'll see your book purchases listed and you'll be able to Deliver them to your new device.