This is a step-by-step guide from Adobe that covers everything that a user needs to setup Dynamic Media. The author has done a great job in collating all the topics and explaining the concepts in a lucid manner. Hope you find this useful:
https://experienceleague.adobe.com/en/docs/experience-manager-cloud-service/content/assets/dynamicme...
https://experienceleague.adobe.com/en/docs/experience-manager-cloud-service/content/assets/dynamicme...
