Dark Fantasy Book Formatting

I have a completed dark-fantasy-romance manuscript and now need its interior professionally laid out for both ebook and paperback release. The novel will go live on platforms such as Kindle (EPUB/KPF) and Amazon print, so the files must pass their preview tools without errors. I already picture ornate chapter headings, stylised scene-break glyphs, and a readable body font, yet I’m open to fresh ideas that keep the reading experience fluid and genre-appropriate.

Deliverables
• Validated EPUB (reflowable) for Kindle and other major retailers
• Print-ready PDF for a 5.5"×8.5" trim size (full bleed) that mirrors the ebook styling
• Source layout file (InDesign, Vellum, or comparable) so I can tweak future editions

Acceptance criteria
• Consistent typography, correct widows–orphans control, proper hyphenation, and live, searchable text
• Front matter (title, copyright, dedication, table of contents) and back matter (acknowledgments, teaser) arranged per KDP guidelines
• Headers, footers, page numbers, and section breaks functioning flawlessly in print proof and Kindle Previewer

If this brief matches your skill set, let me know how you would approach the layout, which software you prefer, and an estimated turnaround time.