It’s That EasyStart at: https://kdp.amazon.com/en_US/Set-up profileCreate new book option to upload book content and book cover.Wait up to 72 hours for it to be approved by Amazon.Voila. You’re a published author. Well, Maybe Not That Easy.

Points to Remember
When uploading manuscripts, be sure to do the due diligence your masterpiece deserves. Simple editing conventions like page breaks (that’s a biggie) need to be adhered to, but by and large if the manuscript is done on Word (DOC/DOCX), HTML (ZIP, HTM, or HTML), MOBI, ePub, Rich Text Format (RTF), Plain Text (TXT), Adobe PDF (PDF), or Kindle Package Format (KPF), the upload is generally easy. Most fonts are accepted, so whether you are artsy-fartsy or downright serious, it should take the font of your choice. Heck, I use Old English, Edwardian Script, Garamond, and Times New Roman in each of my books. (No wonder traditional publishers run screaming when I come their way!)
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Uploading your manuscript is easy. As to the cover, maybe not so much. E-covers are fairly straight forward, but print covers come in an infinite amount of sizes; dependent on the page length of your book. (You have to allow for the thickness of the spine.) My experience with covers created by cover artists is that they are usually very easy to work with and will send your full wrap cover in the correct size as long as you provide them with the appropriate information: type of paper, CORRECT number of pages, and book size—4x6, 6x9, and many sizes in between. Make sure your cover artist/designer is in for the long haul. They should have the means to resize your cover with ease. Here is a handy little link to figure out your print cover size:  File Setup Calculator Don’t worry, it’s safe. It’s from KDP.