Rapid Book Review & Amazon Setup

My nonfiction manuscript is already written and designed; I only need a sharp final pass to catch any obvious grammar or spelling slips, confirm the interior layout still looks clean, and then format it for standard paperback and Kindle release on Amazon KDP... (Budget: $25 - $50 USD, Jobs: Amazon Kindle, Book Design, Book Marketing, Content Writing, eBooks, Proofreading, Publishing, Technical Writing)