Basic Weapons Fire
Once you've targeted, now know how to fire your weapons. Button 1 on the joystick will fire all of your main weapons (Lasers, machine gun, cannons, etc. depending on the weapons installed on your 'Mech). Button 2 will fire your missiles.
Weapons take time to reload, thus they may not all be available every time you pull the trigger.
See the Reload/Recharge rate of the Weapons Specifications.