How do I make it so that the player's arms,head, and tools follow a player's mouse (Help)

I DON’T WANT ANY SCRIPTS OR YOUTUBE TUTORIALS, EXAMPLE SCRIPTS ARE FINE
So I’m trying to make a gun system and Im trying to script (what the title says), like the arm movement in arsenal. Im trying to script this by using mouse.hit and lookvector but I’m not sure what to do next. Honestly I dont have a working script at all. So I was wondering what I can use to script this. Or ideas on how to script this. I dont want any scripts unless the scripts are example scripts or if requested by me.
Thanks.