Fear to cluster and lost VMs

At last time, I got a problem with this, look: http://forum.proxmox.com/threads/166...-in-management

Now I have 1 server with Proxmox working and running so many KVM VMs and other server with Proxmox Fresh install without any VMs running.

Is there any updated docs for this, or can I follow this: https://pve.proxmox.com/wiki/Proxmox_VE_2.0_Cluster

With the server that I already have the VMs running, I should make it the master?

Some fear with this because the last time I got no luck with this!

Thanks for help "Again"!