Many coaches have found it to be advantageous to have a mom or dad volunteer to help with the team in other ways besides coaching.
Your coach is a volunteer and like many of us probably has limited time to devote to coaching. It is a great benefit for someone else to keep the other parents informed and updated with information such as games and practices, but also to help out with organizing who is providing refreshments at the end of each game, organizing carpooling with the other parents to help with the transporting the players, and helping to make phone calls to team members in case of a change in the game or practice schedule.
Even if you know absolutely nothing about the rules of the game, there are ways you can help us and your coach provide your child with an enjoyable experience. Ask your coach if you can help in any way; you may be surprised at the answer.