You shouldn't start a thread to say something like this, you'll be scolded for it by the other forum members. It's best just to bump the thread and reiterate the fact that you're looking to get a question answered.
If you're having alot of question's about something like asteroids, I suggest trying to find to tutorials rather than plowing through it when you don't understand what you're doing.
In order to get bullets to fire one after another, set a timer variable to some constant. Then each loop decrement the variable and when it reaches 0, check that the key is pressed, fire a bullet, then set the timer back to the initial constant.