Help me to choose CPU for home server for openvpn - eviltoast

I have:

I7-2600

I3-4150

I3-3220

How much hdd do i Need ?

How much SSD do i Need?

How DDR3 1600mhz RAM do i Need ?

I use the server only tò use moonlight app that stream videogame tona specific client

I stream simultanely up tò 8 people