The sigils in the center correspond to the sephiroth. They are explained in the appendices of Tarot and Kabbalah.
The magical letters are generally variations on the Hebrew letter of the card. Their alphabets are easily found on the internet, but have no real value once you know the Hebrew letters.
I do not know of any reliable books about those symbols. All of the books I have seen are corrupted.
The meanings you are longing to understand are not written in any physical books, but can only be discovered through awakening consciousness. Meditate, pray, reflect, and be patient. The language of the internal worlds is already known by the consciousness, but we willfully abandoned it.
Through the process of liberating ourselves from the ego, we naturally recover the ability to understand all these things.