You can associate an email domain to your environment for Auto Discovery, which requires users to enter only an email address and credentials (and in some cases select a Group ID from a list) to complete enrollment.
Autodiscovery is a simplified approach that leverages information end users likely already know this information. See Setting up Autodiscovery for more information. Alternatively, if you do not set up an email domain for enrollment, end users are prompted for the Enrollment URL and Group ID, which must be given to them. See the Auto Discovery section of the VMware AirWatch Mobile Device Management Guide for more information on setting up auto discovery enrollment.