Question On This

Processor(s): Two Quad-Core Intel Xeon L5420 2.5GHz 12MB L2 Cache 1333Mhz FSB LGA771
Motherboard: Model X7DCA-L based on Intel 5100/ICH9R chipset with on-board 32MB graphics (this version - YI001 - has no audio ports)
Memory: 16GB (4 x 4GB) PC2-5300P Registered ECC SDRAMDIMMs, two free memory slots for further upgrade
Hard Drive(s): NOT included (4x empty trays only), up to 4 3.5" SATA-II hard drives supported
CD/DVD: No
Floppy: No
NIC: Integrated Dual Intel 82573L Gigabit Ethernet Controller
Operating System: None
Power Supply: Single 280W
Form Factor: 1U Rackmount
This is the box

We are doing a start up hosting company and my main questions are

how do i split up this box into duel core 4gb ram packages some say use Vm Ware esxi whats your recommend or hyper-v?

any input on this will be greatly appreciated

if i put this in the wrong section sorry im new

and do i need a SPLA Licence with this and any idea on how much per use key costs ?