Ebook Question

I did a book layout for someone (for print). She asked if I can now also turn it into an ebook. I’m not sure how to do that. Does anyone have any advice on how to turn it into an ebook?

Thank you so much!

All the publishers i worked with asked me for the open indesign files and the ebook company took the txt from there and turned it into an ebook so i would maybe contact jewish ebooks and ask them for advice. Sorry i cant be more helpful