As you could deduce yourself im a newb and today i have played my first battles. Im very impressed by this game. It looks like World of Tanks 3.0

Two things are very unclear for me:
1. if some lasers have range 270m, will they do any damage at lets say 400m or 300m?
2. the catapult guided missiles:
- after being released with locked target will die go to it themselfs or do i have to keep my crosshair on the targets icon so the crosshair stays red untill they hit?
- do i need to release them after i get red crosshair on the target or can i aquire them target while they are already on the fly?
- if my target disapeares when they are already in the air, will they hit the last known location or what happens then?
Thanks in advance for tips.