The C-MEC which is to replace the Child Support Agency has a new site to provide impartial information and support to help both parents make an informed choice about child maintenance.
 

It includes a ‘Getting Started’ guide which can be downloaded, giving details of the options available for arranging child maintenance, how to start making a child maintenance arrangement, ways to negotiate with the other parent, how to work out the amount of child maintenance and practical steps forward and useful organisations.

See http://www.cmoptions.org/.