You have opened the Composite Application perspective in SAP NetWeaver Developer Studio.
1. Create a new application service.
More information: Creating Application Services
2. Model and protect application services.
More information:
a. Modeling Service Operations
b. Protecting Access to Application Service Operations
3. Define dependencies.
More information: Defining Application Service Dependencies
4. Use external proxies and the query filter to enhance the application.
More information: Filtering Business Object Instances in Application Service
5. Expose the application service as a Web service.
More information: Exposing Application Services or Business Objects as Web Service