So in a way, it sounds like this is more of a bank/stock brokerage? Idk, just sounds like that though... but from what you're saying, the only thing you need to do is to have the funds available and ready when the time comes and you are ready to start taking investment order... but here's the reason why I'm skeptical:
If you are making a niche market where you have a certain business project outlined, the thing is, is that the person who is getting invested into something like this will probably need to know something about what they are doing. So for example: someone who is a computer scientist probably won't know how to economically run a business. People have knowledge in many different fields, and I doubt that "every one" with the funds you are requesting people to have are the only thing they need to make a ROI out of this... Not to mention you need to advertise your product, try to get people to do business with you, and maybe even need to rent out a building to do business at so people know where to go to talk to you about stuff. People don't tend to do business with people when it's all based on the internet, especially the case if you are trying to get people to take over 10,000 cities in America or wherever.