Need help with my shooting in an fps game

https://playcanvas.com/project/1027777/overview/idk-at-this-point

hi. So i am trying to make a simple fps shooter game for my school project and need some help. I have looked at a lot of different examples on this forum but couldnt really understamd what i had to do. I would appreciate any help. I need help with trying to make my gun (banana) shoot and would appreciate help