Microsoft Word Footer and Margin Fix

I need help fixing a few specific issues in a Microsoft Word document:

(1) Footer Issues:
- The footer (page number) is not appearing on every page, or is not continuous on some random page even though I have checked the linking to previous section, checked that it says continue, etc. I have troubleshot this for hours and cannot figure it out.

(2) Margin Issues:
- Margins are uneven, unpredictable. I am using mirror margins (for a book), but the bottom margin is different on the left and right pages, even though I have set them to be the same. I have checked the footer distance and everything else I can think of.

(3) Unique headers for each chapter of the book, but no matter what I do (section breaks, unlink from previous, manually edit, etc.), the headers are all over the place and messed up. I have 23 chapters of a book and each chapter should have their chapter number/name on those pages, but not others.

Very importantly, I need all of these issues to be resolved together, not as individual/separate tasks, because sometimes I am able to fix one of them (like the page number issue) but then as soon as I try to fix the header/chapter label, it then messes up the footer page number. So to consider the whole problem resolved, all these things have to be collectively resolved in the final product.

Ideal skills and experience:
- Very proficient in Microsoft Word
- Experience with footer, header, page number, section break, and margin troubleshooting
- Attention to detail
- Ideally, experience with the formatting of a book to be published by Kindle self-publishing (to understand the formatting required and glitches that can occur between Word and Kindle Direct Publishing).

Please provide a solution to correct these issues so my book looks professional.