First, you should know about your industry. There is a news source online, well several. I prefer Charity Channel. You can access it by clicking here.
Next, evaluate your idea. You can download a free document on how to evaluate your nonprofit idea, before it materializes, by clicking here.
Got volunteers? Chances are you will need them. Don't fly by the seat of your pants once the nonprofit is up and running. Sure, you will need employees. However, volunteers are the business' backbone and the greatest ambassador for your group / business. Click here for more info on how to get volunteers, manage them and keep them coming back!
Finally, you want to check out this resource and become part of it. What is it? The National Council of Nonprofit Organizations. This Council is a network of dozens of state and regional associations ranging from large to small, well-established to just starting up, in all fields, including technology, social service, education, health, and cultural activities. Click here to visit the official webpage.
Starting a nonprofit business or organization can be very rewarding. But the law requires a lot from you. Please check out the resources I provided and then get with a mentor within the industry.