Backers at the US/Canada book tier of $25 are paying for both book and shipping with their pledge. You're paying for the whole thing now.
If you're somewhere else, handling shipping through Kickstarter gets complex. For these backers, I'm using a service provided by my print on demand publisher, DriveThruRPG, that lets you handle shipping yourself at the time the book is ready to be delivered. Your pledge is a partial payment that gets you a code to order the book from DriveThru at-cost (meaning at the publisher's original cost for printing). You'll pay this when the books are ready to be delivered, and handle your own shipping and address information at that time.
The cost for printing will depend on the final page count of the book, but will probably be somewhere between $11 and $13 USD. So your total cost will your $10 pledge paid now, and the raw printing fee and shipping to your country, paid when the books are ready to go (estimated for October 2018).
If you're pledging at the $45 level or above, don't worry about where you're located: I'll handle the extra shipping cost for international backers at these levels.