Some useful links to get you started:
Charity Commission. Advice on setting up and running a charity, plus a searchable database of all registered charities in England and Wales.
Church buildngs and mission. A helpful and practical resource from the Church of England
Community Voluntary Service. Find your local CVS for courses, support and information.
Directory of Social Change . Resources and courses to improve your fundraising skills
Funding Central. A (free for smaller organisations) searchable database of funders for England
Chartered Institute of Fundraising Networking and resources from the world of fundraising.
Small Charity Coalition Networking and support for smaller charities. Free to join
Stewardship A charity committed to supporting more effective giving.
Trustfunding a great resource for finding and applying to trusts and foundations (NB a paid service)