RolexDatejust Ii 41mm Steel Blue Dial Men's Watch 116334

How can I confirm this is real and authentic Rolex?

What is the model # of this watch

What size wrist will this watch fit? I've got large hands and my wrist size is at least nine inches.

My wrist is 9 inches and my hands are large. how much to add the links to fit my wrist? and will i be charged fl tax on my purchase?