You can patent an idea with out a working model, but you must be able to describe how it works, so that someone reading your patent, could actually create your device or service, with out having to innovate new science or processes.For example, if you had an idea for rocket boots, you could not patent it unless you could clearly describe how it would work, so that anyone reading the patent could create it with out having to innovate new science or processes. However, if your idea is a new type of social networking website, and you know how it should work, but not how to program, then you can certainly patent it with enough detail, and then have developers work on it once your granted the patent.
Say for example you thought up an idea to add a projector to mobile phones (i did but it had already been done) you could get a patent using nothing more than a simple drawing of it working and a written description of what it is . If someone who can make it work likes the idea and wants to produce it they will have to pay you as you invented the idea despite your not knowing how to make it work .
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try going to sba.gov to talk with some people that will help without them telling someone else.