The others have told you how to transfer your books from your Kindle to the PC. I can't add to the good advice they've given you.
However, you said you would like "to be able to transfer to my computer from my kindle to work on" (my emphasis).
I'm not sure in what way you want to "work on" the books. The point is that there's not a lot you can do to a Kindle book once it's on your PC.
You can open it in the Kindle for PC application (which is a free download from Amazon) and possibly in other applications like the Mobi Reader. Those programs will let you read the book on your PC, including searching, looking up words in the dictionary, etc. But that's about as far as you can go. For example, you can't print off pages, or copy and paste into other programs.
You can also import the books into Calibre, which is a free library management application. But unless you have a specific need to use any of its features, it's not in itself a compelling reason to transfer your books to your PC.
Hope this helps.
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