Speaking as both an entrepreneur and an attorney, I strongly second Chris Murphy's recommendation that you consult with an attorney about this, not just look for answers here. It sounds like a c corp may be the way to go, but if you were in WA I would recommend you start with an LLC because that is easier to form and manage, and WA has made it very easy to convert an LLC to a c corp when the time is right.
As far as NY, DE, and NV, I have yet to see a good reason to go with anything other than your home state. The real reason people rely on for using DE is that everyone goes with DE, so you should too, but from a legal standpoint it really does not matter, and having a DE or NV corporation requires some additional administrative effort.