My question is simple, i already have a script wich is like the one used in disaster game(waittime, gametime and repeat...), but what i want to do now is after the ENEMY(an AI) health=0 the round ends and players get awarded by the damage dealed to ENEMY
how do i know the damage dealed by each player?
You have to keep track of it. You must ensure that each weapon adds a tag to the AI's humanoid regarding how much damage it did and which player dealt that damage. Some script must "consume" these tags and keep a running total.