Softraid (MD Raid)

I've seen the various posts for users successful in setting up a Softraid environment. I am about to migrate to Proxmox VE from ESXi 5.5.
My system has four drives. One is a rather smallish drive (250G) that is primarily my ESXi boot and OS drive. I have a 1TB drive that has all my VM's. And then I have two 2TB drives that currently are really not being used for much of anything, but I was hoping to setup in a raid1 softraid and made available to my Proxmox KVM VM's.

I really don't have any money to throw at this box. It's not a production system. Just a home server.
I'm hoping to maintain a similar storage arrangement, adding he raid1 array. LVM is even something somewhat foreign to me, but seems with ProxMox it's a necessity?

Any comments?

I'm new to the forums, so early apologies if I've gone awry with respect to forum etiquette.

Thanks in advance.

Chris