If you don’t find correct device type – You can check related device types – it work most of the times – Or you can setup new devicetype (pls see below)
This explains how to start with Fiori, and many other details for Beginers - https://scn.sap.com/thread/3297804 Video explaining Odata service creation from RFC: https://www.youtube.com/watch?v=kICE27JZ6Sc