What are the order of operations for a 501 c3 church to convert to 508 c1a?

Answer- The INCORPORATED church must follow their own bylaws for dissolution of assets.  This usually involves transferring your assets to other 501 c3 organizations.  The dissolution process might also involve an overarching entity’s dissolution rules such as the Baptist Church or Catholic Church agreement.  

“David said= “all the big denominations require a church to incorporate (into their own Baptist Association, for example) to be part of their body.”

Form the new, UNINCORPORATED church before dissolving the INCORPORATED.  Sell property or other assets to the unincorporated church over time.  INCORP church can donate (perhaps do this before starting the dissolution process).