Mouse look and character model?

Hello! i am trying to make an FPS game as my first game but im having some trouble with the mouse look script. i have attached it to my model and it can move side to side all well and good. but when it comes to the Y axis or up and down it moves the whole model. now i also need the camera to have my models arm and gun so i can obviously shoot and such. how do i make it so the whole model turns as one but only the arm goes up and down

I would delete the character and ju8st use the hand and gun also send me an email and Ill hooke you up witha character model I mad I hop it will help you and also Im making a assest with fps and fun AI like Far Cry 3 has all you have to do is place them down and have fun so just send me a message my email is

unityart3ds@gmail.com

Email me.