Distance.....

Hi, I received by JR RAIL PASS today...…Thank you!!

I am landing at Narita Airport on November 6, can I use my pass...……….
How do I activate the pass? Does the train stops at Shinjuku Station? I am staying there for few days.

2) From Tokyo to Kyoto, How many hours?

3) From Kyoto to Hiroshima? How many hours? Can I use JR Pass?

4) Also, Can is come back from Hiroshima and stop at Osaka?

Thank you in advance... Arigato.