You are correct, the .raw disk is the appliance ready to run on Xen or KVM. The easiest way is to use virt-manager to manage your appliance. You can import it and then launch it. To import an existing disk image - start the new virtual machine wizard - it'll have an option for that.
You should have virt-manager already installed on your system I think.
Thank you, Marek. That's very helpful.
I'm going to be using virt-install instead of virt-manager (this is all from the console), but I think I can figure it out from here.
Sure, virt-install is also fine - it does the same job!
Indeed, virt-install works perfectly. Thanks!