How to configure DNS for Services and Pods in Kubernetes?

I have been going through the K8s documentation on DNS for Services and Pods. The main task that I want to resolve is my K8s deployment has NodePort as service type. Meaning, I use the external IP addresses from the nodes to expose the service to the Internet. When I do this, my IP address is getting exposed and would rather prefer to have a hostname [ a DNS name]. Going through the documentation linked above, I do not understand much of the concepts owing to that fact that I'm new to K8s.

I have set-up Ingress Controller from NGINX for Bare Metal K8s because my cloud provider does not provide load balancing service.

So my question is: How do I set-up an ExternalDNS in my K8s cluster?

For reference purposes, these are my resources inside the K8s cluster.

Namespaces
NAME              STATUS   AGE
default           Active   3d12h
ingress-nginx     Active   5h53m
kube-node-lease   Active   3d12h
kube-public       Active   3d12h
kube-system       Active   3d12h

Basically, I have all my deployments inside the default namespace.

kubectl get all -n default

 NAME                               READY   STATUS    RESTARTS   AGE
pod/hello-docker-cc749b757-qfctr   1/1     Running   0          70m

NAME                   TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)          AGE
service/hello-docker   NodePort    10.xxx.xxx.xxx   <none>        3000:30072/TCP   70m
service/kubernetes     ClusterIP   10.xxx.xxx.xxx   <none>        443/TCP          3d12h

NAME                           READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/hello-docker   1/1     1            1           70m

NAME                                     DESIRED   CURRENT   READY   AGE
replicaset.apps/hello-docker-cc749b757   1         1         1       70m

And this is the manifest file I have for service and deployment of hello-docker app:

apiVersion: v1
kind: Service
metadata: 
 name: hello-docker 
 labels:   
   app: hello-docker
spec: 
 type: NodePort
 ports:
 - port: 3000
   targetPort: 8000
   protocol: TCP
   name: http
 selector:
   app: hello-docker

---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: hello-docker
  labels:
    app: hello-docker
spec:
  replicas: 1
  selector:
    matchLabels:
      app: hello-docker
  template:
    metadata:
      labels:
        app: hello-docker
    spec:
      imagePullSecrets:
      - name: regcred
      containers:
      - name: hello-docker
        image: sebastian/hello-docker:1.1
        imagePullPolicy: Always
        ports:
          - containerPort: 8000 

Any feedbacks and suggestions would be highly appreciated.