Osaka to Tokyo

Two of us will landed at Naritia to join a 6 days Canadian Tour package covering Japan Honshu(Kanto, Kansai) which include: Tokyo-Hakone-Mt Fuji-Nagoya-Kyota-Osaka. We will stay in Osaka from Apill 8 to April 10 (3 days) and plan to travel on April 11 by Shinkasen from Osaka to Tokyo (one way only) where we will spend another 4 days from April 11 to Apri 15. How much is the one way ticket from Osaka to Tokyo and what is the duration? Our flight will depart home on April 15 via Narita Airport. Is it worthwhile to purchase this 7 days JR pass . We believe we can use this pass to the airport. If we purchase this 7 days pass, how do we make good use of it by taking some city tours or recommended destinations but not changing hotels? We have the options to change our hotel stay in Osaka but not the Tokyo hotel. We will like to visit Yokohama if possible. Can we upgrade to the Green Class and how much is the extra? We have 2 pieces of 24" luggages (medium size) and a pc of 20" luggage. Is it convenient to store these luggaes in the train. We may have to take only 2 luggages instead. Thank you kindly