I have not ventured intothe world of VM all my HP servers a physical boxes...I have 16 of them
I need to understand the differences between vsphere and vm ware and all that stuff in order to formulate a training plan
any help is appreciated
These pages will help you understand the difference between VMware and vSphere, and the fundamental concepts of virtualization: http://www.vmware.com/virtualization/
Here's the main VMware training page, there are some learning paths that should help.: http://mylearn.vmware.com/mgrreg/index.cfm?ui=www_edu&redirect=off
As written by Scott, start from VMware pages.
VMware is just the company, vSphere is a set of products (ESXi, vCenter Server, ...) to build a virtual infrastructure.