Where to start with Latin literature?
As first recommendations, I would suggest, for Greek, Plato's Apology, and for Latin, the shorter poems (some quite salacious) of Catullus and Martial. All are readily available now in the Loeb collection with parallel text and translation, or online at the splendid Perseus site (Tufts University).
Can you learn Latin from a book?
A good textbook, like Familia Romana, will teach you a good deal of the most frequent aspects of Latin in terms of vocabulary and grammar. However, to progress, you need to read more Latin beyond the textbook. Readers are a great way to encounter a wider range of vocabulary—and also subject matter.
Is Beginner Latin hard?
Latin Grammar Is Incredibly Hard
If there's one thing that everyone who's studied Latin could agree on, it's that the grammar rules are incredibly hard. The word “declension” is enough to send shivers down one's spine. The word order is arbitrary, each of the verbs has several cases and all the nouns have gender.