Most cruise lines send out tickets anywhere from 3-6 weeks before the cruise, no matter when you pay your final payment. Particularly if you're getting airfare through Holland America, the tickets may arrive closer to sailing date.
In the meantime, however, you can go onto the Holland America web site
and look for the tab that says, "For Booked Guests." The drop-down menu includes dress suggestions, shore excursions, and Frequently Asked Questions.