If you have an idea and you have done the necessary thinking and planning, go run with it. Do not wait around for other people to come on board and support you. It might seemed like you cannot do without their support but truth is, you can. You came up with the idea, you strongly believed in it and you have done the necessary planning and thinking. Now go run with it.
And people will take notice. They will most likely be strangers (or just friends who you have not yet met) or perhaps they might be from the unlikeliest of people. Bottomline is, go blaze the trail.