Is the letter H silent in Latin?
The H sound in Latin is very weak. It is in fact often silent. Some choirs learn to pronounce it as a K sound in words like Mihi, or Nihil, but we will not be learning that in this book. J does not make anything close to the sound that English J makes.
Was there aw in Latin?
The classical Latin alphabet, from which the modern European alphabets derived, did not have the "W' character. The "W" sounds were represented by the Latin letter "V" (at the time, not yet distinct from "U").
How do you pronounce ng in Latin?
Depending on where you look (and hear), some will give the pronunciation [g.n], as in English "significant". Most others, however, render it as a velar nasal (like "ng" in English bang) followed by [n], and that is the one that seems more likely, and the one I use.