Bplans.com has a sample business plan that includes financial plan for a non profit organization http://www.bplans.com/spv/3050/?affiliate=powerhomeb

There is a book called Basic Guide to Non-Profit Financial Management which provides info on how to do financial planning for non profits. This is their website http://www.managementhelp.org/finance/np_fnce/np_fnce.htm

Other books worth checking out are

"Financial Planning for Nonprofit Organizations" (Nonprofit Law, Finance, and Management Series) (Hardcover)
by Jody Blazek http://www.amazon.com/gp/product/047112589X/103-9276334-6196601?v=glance&n=283155
The Budget-Building Book for Nonprofits: A Step-by-Step Guide for Managers and Boards (Jossey-Bass Nonprofit & Public Management Series) by Murray Dropkin http://www.amazon.com/gp/product/0787940364/ref=pd_sim_b_1/103-9276334-6196601?ie=UTF8
Cash Flow Management Book for Nonprofits: A Step-by-Step Guide for Managers and Boards by Murray Dropkin http://www.amazon.com/gp/product/0787953857/ref=pd_sim_b_1/103-9276334-6196601?ie=UTF8
Not-for-Profit Accounting Made Easy by Warren Ruppel http://www.amazon.com/gp/product/0471206792/ref=pd_sim_b_2/103-9276334-6196601?ie=UTF8
Bookkeeping for Nonprofits: A Step-by-Step Guide to Nonprofit Accounting by Murray Dropkin http://www.amazon.com/gp/product/0787975400/ref=pd_sim_b_3/103-9276334-6196601?ie=UTF8
Strategic Planning for Nonprofit Organizations, Second Edition by Michael Allison http://www.amazon.com/gp/product/0471445819/ref=pd_sim_b_4/103-9276334-6196601?ie=UTF8