Shinkansen tickets and luggage

Hello.

My husband and I will fly to Japan in May for the first time for 6 weeks. I’ve used the Japan Rail Pass Calculator and because we are staying so long, the Pass is not an option, but is there a Pass for the Osaka and Kyoto area?

How and where can I buy tickets before? The SmartEX App doesn’t exist in my country. But can I use the site www.smart-ex.jp? For the free membership a credit card is required. Is this safe?

And how about the luggage? We think about to send it ahead. Any experiences with that?