Dying to go to Japan where do we start?

My husband and I got married this March. We are just now starting to plan our honeymoon because it didn't make sense for us to take off immediately after our wedding. We also got pretty sick right after so we are definitely glad we are waiting.

My husband and I really want to visit Japan. It's a bucket list goal for both of us. My father in law has a time share and informed us they have a way to trade that and use it stay pretty much anywhere. So hoping that helps a whole lot price wise.

I really don't know where to start planning wise after we make sure that does give us options in Japan. I know we need to get passports renewed and things like that and have been looking up cool things to do but as a whole I'm at a loss.