Reddit mentions of Shipwreck Anthropology (School for Advanced Research Advanced Seminar Series)

Well I would figure out what attracts you to the field in the first place.
Is it the diving? Are you primarily interested in developments in nautical technology or are you more interested in anthropological questions? Do you want to be a professor?

I would strongly recommend reading as much literature as you can do get a grasp on the field as it currently exists. Here are a couple books that I would recommend starting with.

http://www.amazon.com/gp/offer-listing/0306453304/ref=dp_olp_used?ie=UTF8&condition=used

http://www.amazon.com/Shipwreck-Anthropology-Richard-A-Gould/dp/1938645049