there is nothing really different with openvz containers with only the following exceptions
changing the hostname within the container does not persist at reboot, you need to set this on the hostnode or in your vps control panel etc
dns resolvers and network config is done outside the container if the physical host is using venet interfaces, you cannot use cpanel/whm to add IP's or remove them, WHM will detect this and not allow it to happen anyway, if you add ip's outside the vm you need to rebuild the IP address pool for cpanel to see it
other than that its pretty much the same as any other vps except you cant update the kernel