Duplicating and removing enemies

Ive started this game and got to the point where i need to add the enemies. I got a single enemy that comes on the screen at a random speed and when you click him he dies but i want more than one enemy to come. I also want it so that the enemy gets removed when it is dead. I know I have to use a removemovieclip thing but i just cant do it. Ive attached the file so you can have a look and maybe add some more code. Any help would be gr8 :proud: