I have recently found that shot in the head hurts so I would suggest you get a helmet. They cost $20. They come in green or black.
Tactical  lights are also we also helpful. They go well with a pistol. There are several youtube videos that use lights. Make sure they are high powered.
Grips are another thing. The strait collapsible grips are good for close combat. The triangle grips are my favorite. The are good for close combat and don"t get in the way when fighting.

Pics
Top left: Helmet
 Top right: Light

       
Bottom left: Collapsible grip
 Bottom right: Triangle grip