JRPass

Hi all.

We are arriving in Tokyo Narita airport. Will stay in Tokyo for several days. Then want to go to Mt. Guji and at the same day in Osaka. Want to stay in Osaka for several days, visit Kyoto and go back to Tokyo from Osaka.
I have following questions:
1. Which Pass should I buy?
2. Can I buy the Pass in Narita airport or Tokyo central station?
3. Can I use the Shinkansen trains for all these directions indicated above?
4. Where can I find timetable of Shinkansen trains?

Thanks a lot for help.
BR