Hi runnteach, and welcome to cruise-chat.com. And, congratulations on your wedding and honeymoon!
Of the items listed above by Ron, the most important is the paperwork. NCL's documentation requirements may be found
here. Essentially, if you are a U.S. citizen, you will need to provide proof of citizenship as well as proof of identity. Note that any documents you provide (such as birth certificates) must be certified copies, not photocopies.
Also be aware of NCL's new boarding policy (summarized
here) requiring passengers to be onboard the ship at least TWO hours prior to departure time.
Now for the fun stuff. When you're onboard, you'll receive a daily program that lists the days activities. Be on the lookout for any Newlywed gatherings. (Sometimes, they combine it with Anniversary gatherings.) Our first cruise was for our honeymoon, and the cruise line did indeed make it special. So, be sure they know somehow (Your travel agent can handle this for you.)