Don't shout, "SHOOT!, SHOOT!" or "KICK IT, KICK IT!" or "WHAT ARE YOU DOING!?!" Offer minimal instruction to players who are away from the ball.
Your objective must be to facilitate the development of players to play attractive soccer. Attractive soccer is the skillful / cooperative actions of ALL players on a team to maintain possession of the ball with accurate passes to each other using ALL areas of the field in a concerted effort to maneuver the ball toward the opponents goal and SCORE. If we are ultimately working toward well-paced ball circulation, then 1st touch (reception) ball control is our highest priority. Formulate your coaching methods with that technical skill as the primary objective. A well executed reception, turn and pass has much more value than a ball kicked with reckless abandon and no target in mind.
Playing soccer is FUN. Children love free-play. It enhances the development of individual and cooperative DECISION MAKING, crucial to the flow of the game. Adults can help this development by not shouting negatively from the sideline. Shouting divides the player's attention away from the action on the field. Allow the children to make their own on-the-field decisions.