BBs or pellets?If BBs, the first thing you need are good quality safety glasses and try not to shoot at surfaces where the BB can rebound..BB competitions are normally shot at 5 meters by youth in the USA.At that distance they will exactly at point of aim.Pellets are a different story.
Safety glasses are no joke. When I was a kid a BB hit me in the face about an inch below my eye. I got lucky. I was shooting a Coke bottle and it came right back.