What information do I put into Amazon KDP when I'm uploading my webcomic book?

First what I need to do is I need to download the book that I created in google docs. I download it as a docx file. I don't know why they added the "x" to the Microsoft word documents file extension?

Then I go over to Amazon KDP and I choose "create a book".

I choose to create it as a paperback.

<p>The first step is adding:</p><p></p><ul style="text-align: left;"><li>the author info </li><li>a description of the book</li></ul><p></p><div class="separator" style="clear: both; text-align: center;"></div>
<p>That information will be used for the Amazon page where the book is going to be sold.</p><p>Then I also need to choose a category for the book on Amazon.</p><div class="separator" style="clear: both; text-align: center;"></div>
<p>Amazon KDP only lets you choose two categories. </p><p>I just added two categories that are sub-sections under comics and graphic novels. I chose non-fiction and general. I choose that because these comics I make are actually true! So it is non-fiction.</p><div class="tomsbox"><h2 style="text-align: center;">Check out this video for more</h2><p>I made a video talking more about this and the whole process of making my webcomic book. You can check that out on the site here! Making a Webcomic Book on Amazon - Part 3</p></div>