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Start the services
If you elected to have the services run manually, then you will need to launch Windows' Services applet and scroll down through the alphabetical list to the three DataStax services. One-by-one, click each service and start it. You can start the service through its context menu or by clicking on the "play" VCR-style button on the toolbar. Once all three services are running (they should display "Running" in the "Status" column), you're ready to start working.
One value-add you get with DataStax Community (versus the vanilla Apache Cassandra bits) is the OpsCenter utility. Bring it up on your machine by firing up your browser (as long as it's not Internet Explorer, which is unsupported) and navigating to http://localhost:8888.
Look around the dashboard and then, when you're ready to create a database, click the "DATA MODELING" link on the left nav bar (highlighted).
Keyspaces are the units of replication in Cassandra, but you can also think of them as the rough equivalent of databases. The Data Modeling screen lists all existing keyspaces and provides an "Add Keyspace" button (highlighted) to add a new one. Click it now.