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XenServer lets you create VMs, take VM disk snapshots and manage VM workloads.
XenCenter is a graphical, Windows-based user interface. XenCenter allows you to manage XenServer hosts, pools
and shared storage, and to deploy, manage and monitor VMs from your Windows desktop machine.
The XenCenter Help is also a great resource for getting started with XenCenter.
References
[XS Guest] Citrix XenServer 6.2.0 Virtual Machine User's Guide.
[XS Admin] Citrix XenServer 6.2.0 Administrator's Guide.
[Installation] Citrix XenServer 6.2.0 Installation Guide.