Fish doesn't need as much time to be smoked, your Smokey Joe will do fine. Definately thaw. For the halibuts, easy way is to marinade in Italian dressing, then pop em on and grill either direct or indirectly.
Have you ever planked salmon? You can do that on any grill. Let me know if you need info.
The trouble with quotes on the internet is that it difficult to determine whether or not they are genuine - Abraham Lincoln