Getting to the Rhine Fall

Come July, I will be travelling to Switzerland. I intend to do a short trip to Rhine Fall before moving to Lucerne.

How to get to the Rhine Fall from Zurich Flughefan, airport ? Do I need to change train at Zurich HB, can I go directly from Flughefan?

Many sources details from ZurichHB to Schaffhausen, then walk or take local train or bus ride. Other says there are South bank and North bank to view the fall.

So, how is the way to go from Zurich Flughefan. And the way to go if I wish to view the fall directly in front of it ? Is the boat ride there free for Swiss Pass holder. Maybe someone can help to piece the puzzles together.

Also, is there lockers at the train station for me to safekeep my luggage with ?

Thanks

PS: I will remember to bring a rain coat.

There are direct trains from Zurich Airport to Schaffhausen at 1 min past each hour. You can leave your luggage there and take a local train back to Schloss Laufen. Schloss Laufen has no luggage facilities. There are also local buses from the Schaffhausen station that run near the falls that are covered by the Swiss Pass. The boat is the best way to see the falls. It is not covered by the Swiss pass.
Dick