Mandi Lynn has a great channel for new authors to help them figure things out along the way, so go subscribe to her youtube channel, and then come back.
Here’s a video she released recently on how to format your book into an ebook format for various different online shops, and it is super easy. There’s an app for it in fact: calibre.
As Mandi points out, the app isn’t very modern looking, but it gets the job done easily and effectively, which is really what we want, right?
You can download it here.