First download Oracle Exadata Deployment Assistance from below link as per your respective Operating System.
Install it on your machine and click on config to open deployment assistance.
Below are the detailed steps to fill the configuration details.
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Provide organization name, application details, timezone with NTP and DNS Server details.
Select appropriate Exadata Configuration Rack, in our case it's Half Rack High Performance.
Provide network details for Administration and Client connectivity. You should have separate network for admin and client as per best practice.