Firstly your Reservation number is your booking code, that is what you should enter when setting up your Azamara Account. Once you have set up your account, you should see Upcoming Cruises. Click on that then on Manage my Reservation. After that scroll down to Shore Excursions, then click on the paper/pencil icon on the right. That will show any available excursions (although as your cruise is not for well over a year, there may not yet be too many available).
Think you may be right that it’s possibly too early to confirm the departure port.