1. You are correct. vCenter is used to manage multiple ESX(i) host servers and the Virtual machines that run on those hosts. The vSphere client can connect directly to an ESX(i) host to manage just that single host and its virtual machines.
2. ESx(i) will take care of partitioning and formatting the disk space.
3. ESX(i) will provide virtual versions of a sound and a graphics card. They will not mimic the sound and video card installed in the physical hardware.
4. You can not use a CD/DVD burner on the host.
5. You may be able to use a network webcam or use USB device attached to the host to pass through to a guest virtual machine.
6. Visit the VMware HArdware Compatibility list http://vmware.com/go/hcl VMware is a server operating system and has a fairly short list of supprted hardware.
7. The free or trial versions can be instantly upgraded to any of the vSphere versions simply by applying the appropraite license.
I did not really understand some things:
1) The sound of virtual machines can be played from local Clients or not?
2) it is possible to burn from the VM using the Blu-Ray/DVD/CD burner of the local Clients? If yes, this local Clients need some special program to do this?
Waiting for an answer.