All of your questions can be solved by effectively using blueprints. I don’t see why you would need additional written code to do any of these tasks, although it may be useful in some cases to do so.
I started to answer your questions and got to number 3, but it all got erased accidentally. So… I’m just going to say that your questions actually require some pretty complex answers, and although the general principle is easy, there will be lots of bug testing with trial-and-error.
I will say, in reference to question number two, I recommend you open up the “first person blueprint” template and “third person blueprint” template, and compare between the two how the camera’s work. then to solve your question, it’s just a matter of writing a script that switches between the two when certain actions are performed, like aiming your bow-and-arrow. A similar solution could be provided for question three as well.