Yep to all of the above. Go ahead and print your "boarding pass". It is the same as the "fun pass" and will make embarkation much easier. You can also print your luggage tags, if you wish. They are flimsy, of course, if printed on regular paper. You need to laminate 'em and punch a hole in them, or staple the tags to your luggage. Lots of folks think it's much easier to just ask the porter who takes your "checked luggage" for a tag when you get to the port. They have a list of passengers, and the correct cabin number, and can put a tag on each bag when you check them.
Have a GREAT Carnival cruise!