I have no plan, please help

I’ve started to learn Blueprints since half a year, and made a rectangle to fly with it, my own character and map, a main menu and a pistol. But the rectangle and the pistol doesn’t work together. I have done everything, but I don’t know how to struct this. It seems, that Overlap Events are working everytime you overlap something, not only for the object, where the event is. Cast To Character works only at one object at the same time. I moved all scripts to the caracter and the overlapping Event doesn’t work. Can someone tell me, how to do this?

I can’t upload the other pictures.

Can you describe what you want to achieve, “not working” is not a description for me.
one by one, as simple as possible.