All my books need to go back as I have read them. Some are prime a.nd others maybe kindle

Hello, Reg -

Clarification: Are you asking how you can get books (not "boos"), meaning e-books, to read on your Kindle?

If so . . .

Kindle is an e-reader which is proprietary to Amazon - Amazon.com.

I have no idea where you reside - in what country. I am answering from the USA. Fixya.com receives questions from people worldwide.

For your Kindle, you will need to go to the Amazon website for where (country) you reside, then go to the Amazon department for Books, find e-books you wish to read, and order and pay for the Kindle version for those books.

Through the Kindle, owners can also access Amazon's Kindle store.

Read about other ways to obtain e-books to read on your Kindle here, including borrowing e-books from your public library to read on your Kindle:
https://www.amazon.com/gp/help/customer/display.html?nodeId=201252760

There is more information here:
https://www.amazon.com/kindle-dbs/fd/kcp

You may find this How Stuff Works multiple page article on "How the Amazon Kindle Works" instructive:
https://electronics.howstuffworks.com/gadgets/travel/amazon-kindle.htm

There are other options for e-books to read on a Kindle, but this information should be enough to get you started.

Best wishes.

You need to log in the same kindle account and the purchased books will be synced automatically. If this doesn't work, you can convert the kindle books to epub file and transfer to ipad. You need to connect your Kindle device to computer and then convert the books in Kindle. After that, you can transfer the books to ipad with iTunes or iTransfer. For more details, check: A Simple Guide to Help You Read Kindle Books on iPad

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Kindle ebooks are readable via the Kindle app but you have to register the iPad as a destination for download.

Account - Account Settings - Manage your Content and Devices - Devices
.

Amazon Prime is an account with Amazon, it doesn't belong to a device as such. If you are not using the Kindle any more, download the Kindle app onto your notebook desktop, so you can read your books etc.

Amazon com Prime Eligible Kindle Edition Books


You will need to login with your Amazon Prime account, of course.

key in "Kindle First" There are books that are new and you can get one a month free if you have Kindle Prime.

Hi, you can get A Kindle App that allows you to open the kindle book on other devices than a Kindle if this helps!

You get a free kindle ebook for signing up for prime. That is, you can download a free book onto your kindle. You of course do not get a free kindle reader or tablet for signing up for prime. You just get a free download of a book. Sorry. On the plus side, you can still download your free ebook and read it using your desktop computer.