[Users] set computername and domain when vm is created from template.

i'm needing to change the computer name to something based on the vm's name or something and add the system to an active directory domain. this needs to be done when i create new vm's from a template. any suggestions? from what i'm reading, cloud-init is what i'm needing to use, i installed and ran it to check it out. it changed the computer name, but i can't find where to specify the computer name value or how to set domain info.