Ghostwriter for a book

hi, I'm writing a fiction book that's a bit in the direction of
harry potter.
I have written 2 chapters but am a bit stuck,
I need help to continue the book and need about 18-20
chapters. about 1200-1800 words per chapter!
the book is about a man who is part of a secret society. they
are occulta and do Delonian rites. during one night he
receives a revelation en a man who shines like a sun a white
sun. the light touches his chest and he also becomes
peaceful.
the man chooses dp to go against the occult world and starts
to war against them to get hold of a hall that they have. the
item that the evil group has is an item that can save the
world.
the book must contain giants, witches, secret societies
demons and angels, as well as civilians who cannot see the
war in the spirit world!