Some coaches have asked that flash not be used. In any case, shoot one film without a flash first. We can also push the 400 ASA film to 1600, but the results do not equal the P3200 film shot at 1600. Our cost for P3200 film is about twice the cost of 400 ASA film. Telephoto lenses are helpful in many events if you have enough light and can steady the camera.
Many photographers use a monopod to help steady the camera when long lenses are used.
A lightweight tripod with the legs folded together can operate as a monopod to make it more portable. Emphasis should be on active competition between opposing team members. Games that are played with a ball must have the ball in the picture, possibly as a center of attention. In other shots, zero in on some audience reaction at peak moments of excitement or disappointment. Consider a few shots of the coach that show the intensity of the game.