Greetings!
It is fairly straightforward to create a custom report that displays basic device info, including device name, type, model, and serial number.
In your AirWave instance, browse to Reports -> Definitions, then add a new report definition. Give your new report a useful description (e.g., "Device inventory with serial"), and choose the Custom type.
Under Custom Options -> Available Options, expand Inventory and drag the item Devices to the Selected Options box.
Next, under Report Restrictions, choose the desired group, folder, and device filter options. In the Devices section, uncheck all options except Name, Type, Model, and Device Serial.
Choose your desired scheduling, visibility, email, and export options, then click Add (or Add and Run).
Browse to Reports -> Generated, and once your custom report has been generated, check the output to verify that it is what you are expecting. If not, return to your custom report definition and make sure the filter options are selected appropriately.