It may be a bit cold to go clamming, the water temp is currently around 50* at wrightsville
Make sure the area you go clamming in is open for clamming, maps can be found
here (http://www.deh.enr.state.nc.us/shellfish/maps.htm - broken link) and temporary closures can be found
here.
I'm not sure about the best places though there is a really interesting exhibit up at the Beaufort Maritime Museum about Clams, Oysters, Mollusk etc and how they're caught etc.