Hi@akhtar,
The following create-service example shows how to create a service called ecs-simple-service with a task that uses the EC2 launch type. The service uses the sleep360 task definition and it maintains 1 instantiation of the task.
$ aws ecs create-service \
--cluster MyCluster \
--service-name ecs-simple-service \
--task-definition sleep360:2 \
--desired-count 1