Ok, if you go through all the tutorials, you should have a good time with FS2002.
The most important thing in those tutorials our:
1) Straight and level flight
2) Turning
3) Taking off
4) Landing
For the sim you really dont need to know any thing else.
You dont need to know how to use the GPS, you dopnt need to know ATC you dont need to know wind/which runway to land on.
If your just beginning fly around in the cessna (anyone) and experiment with the different options.
Then go and download your first plane when your comftorable with the cessna. Get something fairly fast, like a F-14.
Fly with that untill your comfortable, then download all the planes you want.
That help?