You can use the following tutorials to learn about ad hoc reporting features in Reporting Services. The tutorials can help you learn necessary skills for creating models that you can use in Report Builder or Report Model Query Designer. To find more Reporting Services tutorials, see How Do I Find Tutorials (Reporting Services).
Create reports based on report models within Report Designer and then use Report Designer's functionality to continue to design your report. By using the Report Model Query Designer, you can create a data source, connect to an existing report model, add the fields that you want to your query, and then modify the report definition using Report Designer.