The best advise I have picked up when it comes to righting fight scenes are: focus on why the fight is important and don’t forget about senses beyond sight. Talk about tactile elements, smells, sounds, and tastes.
When it comes to structure I placed a video in May’s Writer Support on fighting. It goes over keeping sentences compact to give an immersive experience kind of giving a feeling for how quickly everything happens in a real fight. Fights are made up of a series of actions and reactions.