Together Locally is a handbook for local churches seeking to work together. Originally written in 1998 for Churches Together in England by Jenny Carpenter who was then the CTE Field Officer for the North and Midlands, the book was reprinted in 2002 and is still helpful. But look here for advice about constitutions. 
 
Together Locally is available as a free pdf download and its contents page is reproduced here for information. 

  
Introduction 

  1. The Call to Local Unity 

Coming Together 

  1. Getting Started 
  1. Building a Framework 
  1. Linking Up 
  1. Deciding Together 
  1. Technicalities not to be overlooked 

Living And Working Together 

  1. Churches Understanding Each Other 
  1. Churches Worshipping and Praying Together 
  1. Churches Learning and Training Together 
  1. Churches Evangelising Together 
  1. Churches Serving their Locality Together 
  1. Churches Relating to their Local Authority Together 
  1. Churches Addressing Justice, Peace and Environmental Issues Together 
  1. Churches Developing International Links Together 
  1. Churches Using Resources Together 

Appendices  
 
I           A New Christian Centre for Horsham: A Case Study in patient ecumenical co-operation 
 
II(a)      Questions to ask when forming a Grouping of Churches Together in a Neighbourhood or Small Town. 
 
II(b)      Draft Constitutional Guidelines for a Grouping of Churches Together in a Neighbourhood or Small Town 
 
III(a)     Questions to ask when forming an Umbrella Grouping of Churches Together for a sizeable town 
 
III(b)     Draft Constitutional Guidelines for an Umbrella Grouping of Churches Together for a sizeable town which has Neighbourhood Churches Together Groups within its Area 
 
Tailpiece 
 
Index of Place Names in England 
 
Information and Addresses