@hf-databricks there's a quickstart guide for creating a workspace with AWS: https://docs.databricks.com/aws/en/admin/workspace/quick-start 

There's a list of requirements:

There's more options for creating workspaces. Above, I just listed the recommended one:

All the best,
BS

It is not about how to create the workspace rather we see a issue on subscription. The link between data bricks and marketplace isnt getting established due to which it says on workspace tab that workspace can't be created.