I was searching for a conversion story that I had read online last year and found interesting when I ran across Moira Noonan's story. I haven't read her book Ransomed from Darkness but you can get a general idea of what it's about from the link above. Sometimes the dangers of the occult are best pointed out by those who were involved in it.
In the Vatican Document, Jesus Christ - The Bearer of the Water of Life, we can read what the Church has to say about the New Age Movement. It helps us understand why this movement doesn't fit in with Catholicism and never will.