Perhaps you should google "diversity jurisdiction" to understand what the attorneys are trying to tell you. It is a legal requirement to obtain jurisdiction in federal court, where you can sue them all together. Otherwise, you need to sue them individually in state courts.
This isn't the type of case where an attorney is going to take the case on contingency. You'll need to pay an attorney a retainer fee up front and pay by the hour.
Pro se is very difficult to do in a complex case.
I'm next door in Lancaster, NY. Contact my office and I'll meet with you to obtain more information. There are missing facts, as is evidenced by the other attorneys' replies.
Ph. (716) 601-1000
There is a difference between creating a nonprofit and obtaining the 501c3 designation. You can create the nonprofit by filing with the secretary of state or division of corporations in your state. They will also tell you of any other requirements, for example, publishing requirements.
The 501c3 will enable your donors to deduct their donations, among other things.