There are a number of free resources on the internet which you might find helpful.
South Yorks Funding Advice Bureau
http://www.syfab.org.uk/infosht.php produce a range of really useful information sheets on topics such as funding for arts organisations, charitable trusts, funding for individuals through to European funding. These cover the essentials and provide a great place to start.
Two organisations that provide low cost or free training and other opportunities to small charities are: