Welcome to Just Act and thanks for your question – you’ve come to the right place.
Could I ask a little more about your organsiation so some of our Community Champions can help out too?
You may find the information in Step 4 helpful: http://www.justact.org.uk/category/step-04-create-an-organisation/
There is a resource in there from Third Sector called ‘What legal structure should my group have?’: http://www.justact.org.uk/2014/09/12/what-legal-structure-should-my-group-have/
It features advice from legal experts and covers a variety of structures, listed on the Charity Commission website: https://www.gov.uk/charity-types-how-to-choose-a-structure
And a resource from Community Matters on setting up a community organisation too, which covers legal structures: http://www.justact.org.uk/2014/04/29/setting-up-a-community-organisation/