a script to but it on the empty game object to shoot and damage the other characters
-a code to but in my script to play the shooting animation ( i have a script i can play walking and idle animations when i put it on the empty game object (gun) .)
A range of exclamation marks and the order to others to basically write a script for you did not result in what will be expected. Never.
Look at one of the example projects, everything you need is included. Educate yourself, try things out, make yourself familiar with Unity. What you are asking for is pretty basic.