For your rerefence, the CCNA Cloud CLDADM 210-455 Official Cert Guide is available for purchase directly through Cisco Press.
You can find a variety of supplemental recources in the CLDADM Study Material page. In addition, a self paced e-learning option is also available directly through the Cisco Learning Network Store, with a free evaluation to try out. See: Introducing Cisco Cloud Administration (CLDADM)
Lastly, if you prefer classroom training, there is a recommended training course available to help prepare for the exam. For more information, see: Introducing Cisco Cloud Administration (CLDADM)
For all other CCNA Cloud information, including complete requirements, exam topics, and more visit CCNA Cloud
Good luck on your studies!
Cisco Learning Network Moderator