No, Amazon do not require ISBN numbers for publishing to the Kindle.
If it is unused then you can assign an ISBN to your ebook. If it is already assigned to a paper copy, then it cannot be used as ISBNs refer to a particular publisher and format of a book. You don't need an ISBN number to publish to the Kindle.
We are happy to use any ideas or images you have to create a more polished cover.
Payment from Amazon is either by cheque or by electronic fund transfer. These are 60 days in arrears.
We accept Microsoft Word (all versions), Open Office .odt files, Adobe InDesign, Adobe PDF, HTML, TXT, RTF.
We aim to have your book converted and available on Amazon within 7 working days. Cover design may take a little more time as we will need your feedback on our creations.
No, you keep all the rights to your book.
You can choose two sales categories to allow people to find your book, and seven keywords for people to search by. You can find a full list of the categories here.