How to create a bucket in an installed cloud and execute commands related to the Storage organization of the cloud

Bucket is a terminology related to cloud storage. Bucket is a container to store data called as data objects
Google and many other cloud service providers provide Storage as a Service including AWS Cloud (Amazon Web Service).
What is Storage as a Service ?
You need to register on the google cloud platform, for that you need a credit card. Google give one month subscription free after that you have to pay as per your use/ As you all know cloud computing means "Pay Per Use"
See the google cloud pricing here