Duplicating Real world in the sim commercially

With so many different utility add-ons out there, I was just wandering what is available to create a Commercial flight just like in real world. I know that airlines have a Dispatcher that is a key part but what can be used to create a commercial flight from start to finish?How does a pilot of lets say a 73 start the flight with filing a flight plan, loading the FMC, knowing how much fuel to have on board etc..?Is this all done by a Dispatcher? I get the idea the route is planned by the Dispatcher but who files it and when in relation to the flight time?Kilstorm