Hi, I have years of experience formatting ebooks and print books. Usually this is through Amazon's KDP platform, but I have used other platforms (or as you say 'avenues') too. Although I'm native UK, with a degree in English and proofreading qualifications, most of my clients tend to be from the US and you'll see that I am certified in US English. I also have my own ISBNs and small publishing company. Text and artwork will be formatted professionally, and your existing dust jacket design will be sized appropriately to the necessary specifications.