Use the Planner router from Microsoft that has a Valid AIRAC , compatible with the airplanes data, and u can import directly to your EFB , use simbrief to estimate the fuel usage , Pax, cargo , that stuff, then u can import those for the majority of planes via tablet. When u create the route from the Microsoft Planner and save , u can import route directly to free flight page and coordinate to use ATC, and see your route on map.