My dedicants start their book with the following for each Sabbat:

• A ritual to be performed solitary
• A ritual to be performed in coven
• One page of chants/lore/incense/other correspondences appropriate to sabbat
• One “craft” or other holiday working
• A “fun fact” page.

They must also prepare (and include):

• A full moon ritual for one and for a group
• A new moon ritual (or other working) for one and a group
• An all-purpose healing ritual
• A devotional ritual for working with a God and Goddess of their choice (patrons)
• A ritual for working with a totem.

By the time the dedication year is up, they have a good skeleton start to a solid BOS. Then they start getting the Traditional stuff.

You will also want to include any information you come upon that seems useful and your thoughts on it, any workings that you do and notes, etc.