To use this tool you will need the Dynamics CRM SDK.
All of these options appear at the MS Page Create early bound entity classes with the code generation tool (CrmSvcUtil.exe). This program simplifies the process by allowing the data to be typed into simple fields.
At the minimum you will need
URL
enter your URL which will be something like this:
https://yourorg.yourcompany.com/XRMServices/2011/Organization.svc
Your exact url can be found in CRM by clicking: Settings -> Customizations -> Developer Resources -> Organizational Services
Output File
select a file location and put a file name such as EarlyBound in the name field.
CrmSvcUtil.exe
This tool is found in the Dynamics SDK in the bin folder.
All the field descriptions are available on the above MS page. You can also hover over the fields for descriptions.
Happy Coding!