Search for “engrave book” or “book cover” or what have you, that way we don’t have to spend so much time rewriting this sort of thing. Sometimes it’s hard to figure out the best search terms, but with a little trial and error, you can almost always find what you are looking for.
Another reiteration that every single book is different and you will need to plan for testing. The advice to start light and work up to an aesthetic you like is spot on. And some books don’t even engrave well at all no matter the settings. It really just depends on the book and the design you’re trying to accomplish.
I gave some settings advice on this thread:
Feel free to message me if you want to discuss in more detail.