Hi there,
Thank you for considering my proposal.
Could you please let me know if you have the source files or just the PDF file?
For Amazon KDP, first you have to make sure that you use the right margins and page#. In case you haven't used the proper margin size or page#, the only way to rectify that is with the source file (can be done with PDF but will have to increase the budget a lot).
Then we have to make sure that you use either CMYK or RGB colors, not both, next have to check the fonts to make sure they are all embedded and if not embed them.
Basically that's about it (hopefully your page size is correct already).
Please do have a look at some of my other work here:
https://www.freelancer.com/u/Marzia87
If you wanted to talk more and had any questions, just drop me a message :)
Hope to hear from you,
Marzi