The one thing different about publishing Kindle singles is that Amazon actually vets the books they agree to publish under their Kindle Singles program. You can nominate your own book by emailing them an attachment if your book is not published, or the title, ASIN and a summary if it is already published.

You can submit works that youâ€™re only outlining or that youâ€™ve completed a bit of writing on to get approval, or you can wait until you publish it under your normal KDP account and then see if you can get it approved.

Master Resell Rights Terms and Conditions

[YES] Can sell and keep 100% of the sales.
[YES] Can edit the sales letter and graphics.
[YES] Can be bundled into another paid package and sell at a higher price.
[YES] Can be added into a paid membership site.
[YES] Can pass on the Resell Rights privilege to your customers.

[NO] Cannot be given away for free.