At $50MM and assuming a fee load of 1%, this ETF would only generate $500k in fees; That needs to be split with distributors (can be as high as 50%). Then, there are legal and administration expenses. Given the economics, who would want to buy this 'idea' off of you? It doesn't make anyone any money.
You want to partner with a lawyer in exchange for his services-- in other words p, he gets paid on the back end much more than he would have recd hourly-- many lawyers would do this if you can sell them on the idea. Don't ever pay upfront, if you can't afford it, split your profits with someone is much smarter plus you will have a partner for future issues/ problems. Good luck, sounds like an exciting idea! Surf. On ipad, sorry for mistakes. Ps. I'll be happy to make a few calls for you if I think the idea makes sense. I know some folks in that space.