Alrighty i dled the demo cause i wanted a feel of what lock on was gonna be like. i have a joystick i think its called a sidewinder but any who i can fly the plane and control the speed but every command is so damn confusing! and when doing any missions on the demo i cant even fire my weapons!!! it says space bar i press it and nothing so can someone plz help me set it up so i can enjoy the game lol?

Im guessing you didn't change from NAV mode to one of the Combat Modes.
Nav Mode is the 1 Key.

Once you're in the right combat mode you can select weapons.

(the red change items don't apply for the demo version)

And go kill something.