Something that's been frustrating me...

Here's the thing; despite my love for Flight Simulation, I'm not actually very good at flying in-sim. Most of my flying comprises taking a random aircraft, placing it at a random airport, taking off and then simply going absolutely bananas with the joystick.
I would like to start flying proper - long-ish haul flights in airliners seems a sensible way to go. But therein lies a problem. I've never been able to get to grips with the flight director switch. Could someone please explain how I'd get a typical airliner in FS to follow a course automatically, rather than lining the plane up manually on the little pink line on the gps and then selecting the 'wing level' switch?
Any help would be hugely appreciated.
I would like to start flying proper - long-ish haul flights in airliners seems a sensible way to go. But therein lies a problem. I've never been able to get to grips with the flight director switch. Could someone please explain how I'd get a typical airliner in FS to follow a course automatically, rather than lining the plane up manually on the little pink line on the gps and then selecting the 'wing level' switch?
Any help would be hugely appreciated.
