Where can I find an official template which describes how to create your .yaml file to setup services/pods in Kubernetes?
You can find the specification for a pod here http://kubernetes.io/docs/api-reference/v1/definitions/#_v1_pod
A good starting point is also the examples https://github.com/kubernetes/kubernetes/tree/master/examples
Additional you can create the ressource via kubectl and export the resource to yaml
e.g. for a pod you can run this command:
kubectl run nginx --image=nginx kubectl get pods ngnix -o yaml > pod.yaml