Look through the digital photos available for use in the online vertical-format photo book and choose the photos you want. The photos in your vertical-format book of course need not themselves be vertical; they can be in horizontal or square format or whatever you'd like. But large photos with a vertical orientation, such as portraits, would certainly go well in a book that is taller than it is wide.
Visit the various photo-book creation sites on the Internet that provide vertical-format and large-format photo-book creation and printing, then choose a site to work with. Look specifically for sites that allow 9-by-12 vertical printing from edge to edge across the page with no borders.
Create an account with the chosen photo-book-creation site and log on to the site. If the site requires, choose a vertical-format template in a 9-by-12 size or larger that provides for no-border printing.
Name the photo book and click "Save" to create the photo book in the book site's system.
Upload the chosen vertical photos into the template book pages according to the site's particular uploading instructions. Move the photos around and try different groupings, then decide on a final order for the online book.
Choose a cover photo and add any title text, then save the final photo book.
Share the photo book with friends and family by sending links to the online version, or ordering printed versions for hard-copy delivery.