Once you have responded to the invitation you are able to post whatever information you want to share about your book or books. As a suggestion you'll probably want to include:
Your Book Name in the Title of the post (if you have several books each one should be in a separate post.) Subject, for example Snowflakes Those 3 things can be made Labels which make the blog easier to search.
The country of origin as this will tell people what kind of shipping charges to expect.
Then you will want to include any information you think is pertinent, for example you may want to let them know the size of the book, the number of patterns, how it's bound, or if it is electronic.
The price of the book.
Where to buy the book.
Add some pictures of the cover or anything you'd like to highlight that is inside the book.
This blog wasn't set up so that the books could be sold from here, but if anyone has a book who doesn't have a web page or blog, they could sell it from here just by using a PayPal invoice.
I used my own book as an example below.