Once you've configure the masters, you can join the worker nodes to the cluster. You can only do this once you've installed networking, the container, and any other prerequisites you've added to your clusters such as DNS, though. However, before you add the worker nodes, you'll need to configure a pod network. You can find more information about the pod network add-on here: https://kubernetes.io/docs/setup/independent/create-cluster-kubeadm/#pod-network.