I am going to order a cleaned and scaled sea bass or grouper and plan to grill it whole. I was going to stuff the cavity with fennel fronds, whole scallions, lemon slices, S&P. Do I need to do anything else to it beyond throwing it on a well heated grill? Like oil it or line the grill with foil, or both? For a 3 pound fish, how long should I cook it? TIA!