Assigning two dif. shoting buttons to the spaceship game

hi everyone i joined the forum cuse i found so much helpful stuff in it is amazing, but more amazing is how knowledgeable the people in here are.in advance thanks really to everyone cuse of this site i got back into drawing again and now trying to learn the actionscript…so now to my problem.

WHEN HELPING ME KEEP IN MIND I AM A BEGINNER I REPEAT A BEGINNER IN ACTION SCRIPT. THANKS

i am creating this game. an mc called spaceship shots mc called laser when u press “space” key. and the “background” scrolls when u move the “spaceship” …i have three problems:

1)if you hold the “space” key down it wont stop shoting.
a)i want to have to press the “space” key to shot
2)after the “laser” mc hits the mc caller “enemy” the mc “laser” doesnt disappear it keeps going until it leaves the screen.
a)i want the “laser” to disappear whenever it hits and “enemy”.
3)i want the mc called “spaceship” to shot mc called “missile” when u press the “m” key.
a)i tried using the same code i used on the “laser” by just replacing the “laser” with the “missile” and the “space” with “m” but it gave me and error.
b)i dont know where to put the code for the “missile” i mean i know it must go on the “spaceship” but where?
c)i also want the “missile” to disappear when it hits and “enemy”

thanks guys i really need your help i am so dumb when it comes to actionscript. i just been copy pasting codes i see on here and on www.flashkit.com and [url=“http://www.actionscript.org”]www.actionscript.org. sorry i cant show u the game so far or show u the coding but my hard drive where the game is store is acting weird.but i should have it fix in a few days … i think.