If you want to add servers to SharePoint Portal Server 2007 farm, only options which willl be available are "Complete" or "Web Front End". It is better to choose Complete and turn off services not required for the WFE server when installing a WFE so that you retain the flexibility of changing roles later. If you use the WFE option and choose to add other services to the server later, you must reinstall SharePoint Server 2007 to add the new functionality to the server.
When you run the Configuration Wizard, however, you must choose to join the farm by picking the appropriate configuration database that defines the farm. The information in the configuration database will be used to configure SharePoint Server 2007 on the new server. The existing configuration database names can be retrieved after you identify the database server.
After the Configuration Wizard completes, you will define the role of the new server in Central Administration by starting and stopping services. If you're coming from a SharePoint Portal Server 2003 background, you'll find that there is no server selection screen with clean check boxes. Instead, starting and stopping services in Central Administration on each server is the method you'll use to assign server roles in the farm. This is much more granular in defining roles, and the hard-coded farm structures of SharePoint Portal Server 2003 are gone.
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