Details on what makes a good business plan and how to get started writing one. Also includes templates and informative videos. From Santa Clara University's My Own Business Institute.
Includes outlines and summaries of the different Business Plan sections and financial data worksheets to get you started - from Farmingdale State College.
An easy-to-read blog post from HubSpot (a marketing firm) that details what a business plan should look like and provides examples. Keep in mind that HubSpot is a for-profit website so not all linked resources will be free.