Investment pool

I have an invention and need capital for people to invest making a solid investment pool with good montly returns inwhich I take a percentage ofcourse. How do set that up what factors are important working out a good formula. People could invest throughout crypto and bet paid in what ever currency they wish.

Would like to help support local need alsofrom profits made. My own made coin on blockchain?

I need a good worked out plan first where every aspect is clear, all factors considered. I guess a good marketing/ business plan is my priority to see my own project given green light!