Should be fine. vPro isn't needed to run ESXi. You might be a bit short of RAM (ESXi itself consumes ~1.5GB) so you won't have a huge amount left over for VMs.
If your objective is to learn about virtualisation, you may be better off with Proxmox for now which is lighter and gives you a GUI. If you need to learn ESXi then it will work, it'll just be a bit cramped.