I'm not a newbie, and have had good, bad, and very ugly roosters. The bad boys work well in the crock pot, and when small children are involved, that's where they belong. "Retraining" a cock who wants to attack humans rarely makes him safe for everyone. A critter who attacks someone 20X...
Crock pot, or send him to someone who will eat him. Dangerous, especially for a child!!! He'll only get worse, and there are many nice cockrels out there to find, or raise chicks in spring to select another. Mary