Well, I haven't done one before but this is what I'm doing....and I expect someone will set me straight if I'm wrong.
There are 12 people in the group. Each person selects their own theme & book size. They also decide if there are any special instructions for
their book - aimed at the people who will be working in the book: such as nothing lumpy, DO include a picture of yourself, please use only pastel colors, etc, etc. You don't
need special instructions, but you can have them as desired...and they can be inclusive or restrictive (do or do not use xxxxx)
Each person needs to create a page or two for those instructions & a page or two for sign ins. Most people alter the cover of the album they've selected - to go with their theme. People using a spiral bound album tend to remove the wire & replace with something like ribbons.
The host sets the "circle" - the order the books will move from person to person. If you were doing a CJ, you might be requested to send to someone in FL. Every month you would finish the book you received in the mail & send on to the person in FL. You may be getting from someone in MS. Every month you receive from MS & send the one you've finished to FL. At the end of the year, you will have worked on 12 books & forwarded them.
When you receive a book you read through the special instructions & create a 2pg (or 4pg but always an even number) LO using the theme they've selected - THEIR theme with YOUR response and YOUR pictures. For example, if the 1st book you get has the theme "my favorite WDW restaurant" you'd create a LO about the character meal at 1900 Park Fare (if that's what you enjoyed most) and include pictures of yourself either at the meal or in some way related to that theme. (You might not have the most obvious picture for someone's theme. Be creative.)