Publishing your content for Amazon’s Kindle

Kindle publishing is done through a part of Amazon which is the Digital Text Platform, or DTP.
Digital Text Platform requires a sign-up process similar to
CreateSpace, and is completely separate. This means that if you
intend to publish both physical books and eBooks you will need to
enter all your information regarding taxes and royalties twice. It’s not
a big deal, as it only takes a few minutes, but it’s worth pointing out.
If you have a current Amazon account, you can use this information to
log into DTP. You do not have to set up a new account to use DTP.
There is no charge to you to publish your content for kindle readers.

Unlike CreateSpace, you will not require an ISBN, nor will you be
required to purchase a proof copy of your title before it’s made
available for purchase on Amazon.com. For this reason alone it makes
sense to publish all of your content for the Kindle, don’t you think?

Uploading Your Kindle Publishing

Uploading your content for sale in Kindle format is similar to that of
CreateSpace. Once you’ve created a DTP account, you click on
Bookshelf, and Add a new Title to start publishing. You’ll be asked the
same basic questions about your book as you were when you
published via CreateSpace, with one notable exception: the ISBN. For
eBooks, an ISBN is not required (though you can use one if you like).

We should also note here that if you have an ISBN for a physical book,
you cannot use the same ISBN for your eBook of the same title. ISBNs
must be unique for each title, edition, and format of your book. Even a
hardcover and paperback of the same title have two different ISBNs.
DTP does not provide ISBNs. If you choose to use an ISBN, you must
purchase your own.
If you’re publishing content for the Kindle that you’ve already
published as a physical book through CreateSpace where you provided
your own ISBN, you probably have an extra number you can use.
Otherwise, don’t worry about it.