Narratives

Does anyone have any narrative exemplars or any ideas I have no idea what the heck to do…. I was thinking either a plot were it’s a war setting and these two guys from opposite sides form a friendship but then the end one of em pulls the trigger bending them OR a girl who hires a hit man for herself but makes the reader thinks it’s for her friends or parents But I don’t know how to do a rising climax/peak or start HELP

THANKS!!! I would appreciate any examples