The U.S. Consumer Product Safety Commission publishes a document called CPSC Public Playground Guidelines. This 57-page tome has tons of practical information. While not all of the information will pertain to your church, there is a wealth of information in it. Perhaps the best way to digest all the data is to have an outside professional help you.
One such person to help evaluate playgrounds is Reagan Hillier of Worlds of Wow! Worlds of Wow! sponsored the XP-Seminar for many years. They have shown themselves to be abreast of current regulations and know the church scene from coast-to-coast.
Enjoy the CPSC Playground Guidelines.