New player need help with Fire Combat

Greetings!

      I hope I have these time-space coordinates correct.......

Anyway I hope that someone can straighten my notions of weapon combat
out before I run my first game. (NEVER played before- ME THE GM!)

    1)  Some of the weapons can shoot more than one shot per round.
       If a gun can release five bullets per pull of the trigger, does
       he have to attack the same target?

    2)  If the above player wants the five bullets to hit one target,
       Does the player roll once for all slugs or is it 1 roll per
       slug?

    3)    When it comes down to whittling away the amount of damage
        any weapon does, what happens to fractions?  Dropped, saved
        till they equal a point or WHAT?

            ( A nice detailed report of this one would be helpful )

I suppose that is all for now!

Thanks.         Chris Niziol      ([email removed])