Request for informaton

Hello..

We are planning to purchase the 7 day JRPass and want t o confirm that we can buy our JRPass online.

We are arriving Tokyo on 6/14 and want to leave for Kyoto on 6/17. Which Tokyo station can we get on the bullet train for Kyoto?

Also, where are the bullet train stations out of Kyoto going to Osaka and then in Osaka going back to Tokyo?

Thanks for your help..

Tony D