To add to your misery, NO device fully supports any of the above.
So start with something simple, even a few lines. View it a reader for whatever device you are aiming at and go from there. Epubs containing mostly text are going to have the least problems, so that might be a place to start. Sigil is great program that handles many of the details for you, if you have an html file to feed it, or you can type in directly or paste in text. Many start with Word, export as filtered html, or use a macro by Toxaris available here, then open in Sigil to finish off things.
There is a library here which has thousands of books. You can open the files that make up the epubs with calibre or sigil, or unzip them and display them in any text editor you like. Just make sure you do not re-zip them yourself without knowing a few further arcane rules.
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