If you choose the Caring for Children training you will need to order the books to get started.
These are the books you will need to complete the Infant and Toddler training.
https://shop.teachingstrategies.com/page/7494_ITCaringFor.cfm
Caring for Infants & Toddlers, Second Edition Item #7494 Price $54.95 and the
Skill-Building Journal: Caring for Infants & Toddlers, Second Edition Item #7508 Price $29.95
For Preschool training you will need these books
http://shop.teachingstrategies.com/page/7753_PSCaringFor.cfm
Caring for Preschool Children, Third Edition Item #7753 $54.95 and the
Skill-Building Journal: Caring for Preschool Children, Third Edition Item #777X $ 29.95
You may be able to find used books at Amazon.com or Bookbyte https://www.bookbyte.com/