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My native language is Spanish. An interesting thing about it is that changing the word order generally does not change the meaning but it changes how it sounds (more prosaic or more poetic). That's not a hard rule, I'm sure you can also find examples where changing the word order changes the meaning.

I also agree with the rest of the comments here, the original Don Quixote is not a good book for learning Spanish, see here https://en.m.wikipedia.org/wiki/Don_Quixote#Style

A modern children's adaptation of the story may be a good choice for learning if OP wants to use the same story.

It depends a lot on what books. Many technical books age extremely quickly. You definitely don't want a 30 years old C++ book except for some sort of historical research purpose.

But even in literature there is timing, themes, references and fashion. You'd have a hard time writing Don Quixote today, because hardly anyone reads chivalric romances anymore, so the vast majority of people wouldn't know what you're even parodying. And I suspect most modern readers of Don Quixote don't really get it, excluding those with an education in european medieval literature.

Even without going that far, there are fads and fashions. If you want to write about wizards or vampires there probably are better and worse times to do it.

Even playing your cards right, how likely are you to get a hit? Because there's really no lack of good books on most any subject at this point, and it takes a very dedicated reader to exhaust the existing catalog, and the easiest way for a reader is to find out what's popular and try that, rather than giving a new author a chance.