For a full rundown on Datasets and how to define them, click here. If a Workspace does not have any datasets connected, then no data will appear. Once you've defined your datasets and created a Workspace, next you’ll need to connect your datasets.
To Connect a Dataset to a Workspace:
Navigate to your desired Workspace
Select Datasets from the Main Workspace Menu
Navigate to the Dataset in the dialog
Select CONNECT on the Dataset(s) you want to connect to this Workspace
Select CONNECT ACCOUNT
Once you’ve connected your datasets, your data will be available for querying and transformation within the Workspace.