Before you may start a Tome, you must first purchase one at one of the local magic shops IC. There is a variety of choices, so choose one that is perfect for your character.
Once you have bought one, you will find a thread started here, specifically for your character. Your first post will contain the photo of your chosen Book.
Any type of magical inscription or photo may be placed in here. But first, you must have obtained knowledge of it. Example, in order to place a spell here, you must have already written/said the spell. If it is a spell that someone else has created, you must first obtain their permission, IC, to place it in your book. If you wish to place to photo and bio of a witch or other Good creature, you must have first done some research or actually met this person. If you have only met the person, you may only post what you know about them. But it doens't have to be agical. Often, Tomes are used as journals just as much as magical indexes. It is entirely up to the character who writes the book.
If you are unsure about anything else, please see the Sample Tome or Magically Chaotic.