For inexperienced divers wanting to try North Carolina wreck diving the OBX is not the best base of operations.
Some geographic info: The cold Labrador Current pushes in from the north and the warm Gulf stream pushes in from the South. These currents divide North Carolina waters into 2 zones- Your diving experience will vary greatly depending on whether you dive North or South of the Diamond Shoals.
Generally it's North: cold green murky (think New Jersey) and South: warm blue clear (think Florida).
So if you want to dive from the OBX area, you probably want to head South from there to the Diamond Shoals or even further since the currents at the shoals are wicked. The boat ride from up there would be too long to make it south of Cape Lookout to the somewhat more protected waters of Onslow Bay.
You would typically be diving at least 20 miles from land in 2-4 ft seas and with some (perhaps stiff) current. The viz could be 20 ft or 100 ft. You will most likely not be able to see the dive boat from the wreck. It's not easy diving and in the open Atlantic conditions can go to Hell very fast.
Do you have experience in currents and seas? Do you have good navigation skills? Do you like long boat rides? Do you own your own gear, including tanks? Are you nitrox certified? Are you comfortable diving with sharks and other large creatures? Do you know how to plan repetitive dives to 100-120 ft? Do you know how much gas you would need? Do you know how to make a negative entry? Are you in decent shape? Do you have dive accident insurance? Would you remain calm while drifting for an hour in the open Atlantic far from the boat?
Unless you can say yes to all of the above I'd be willing to bet that you'd be spending so much effort on worrying about a lot of new stuff that you wouldn't be able to enjoy the dives. And diving is supposed to be fun.
These links are worth a read:
Diving Safety and Your Dive Skills
Dive Primer on how to dive Hatteras
There's great diving up there, but the inexperienced diver would be much better off operating out of Wilmington or the Morehead City area and starting with some of the in shore wrecks.