If you're not going out to the shrimp boats for ling, you have to find structure. Ling are an incredibly structure oriented fish: unless on the rare chance you sneak up on an ocean running school. In all my offshore experience, that's only happened once for me.
Kingfish: well, you're on the right track. You might want to throw a few topwaters, the bigger the better, if you can afford the lost tackle.