Install WebSphere Application Server Network Deployment from the installation media. The default installation is used, without any configuration changes.
If installing the Deployment Manager as a service a user account should be created in advance so that it can be used as the credentials for the service. This user account must have administrator privileges.
You should not install WebSphere Application Server Network Deployment to a directory that contains spaces in the name, in other words do not use the default Program Files directory.