how is it supposed I consume Atomic images in the repository in subject?

For example, I select 

CentOS 7 Atomic Host Image v1609 for x86_64 (4cc949e)

import

and I have a disk

I then create a VM with OS Red Hat Atomic 7.x and attach that disk to VM and connect network

What have I to do to setup network, users and SSH keys on it?

Run once --> Initial Run --> Select "Use Cloud Init"

or what?

Does the image correspond to the qcow2 one downloadable from 

or does it contain any customization already related for deploying in oVirt itself?

Thanks,

Gianluca