If you're after cod, coalies, pollack, mackerel and wrasse on the fly then there are deep water marks at the Beacons (Newbiggin), Cullernose Point/Craster/Dunstanburgh Castle area, Beadnell and Seahouses. The beaches at Blyth, Cambois, Druridge Bay, Warkworth, Alnmouth and Embleton are worth a go for bass, flatties and even sea trout.
Good luck and let me know how you get on.