Solo backpacker

Hi..
I am mega
I have a plan go to tokyo on july 18 2019.i land in narita airport afternoon.i will travel for 10 day 9 night.i am solo travelling.can u help about my itinerary.maybe u have any idea for my first trip in japan.i want ago to tokyo,kyoto,hiroshima,tokyo,yokohama,nikko,and i want sightseeing hakone or fujiyama mountain (witch one you prefer for me ). May i buy JR Pass or whitch one JR?
Thank you so much for your help and attention