Quote from: SamTheRecordMan on Today at 05:35:27 AM

How do I find (and trust) programmers to create it?

You can create a proper Job Hiring announcement in Services and Project Development section along with all the detailed requirement for your project or idea. It could be the following:

Detailed description of your idea
Job Details
Amount of money you are willing to spend
Deadline
Job Porfolio

Quote from: SamTheRecordMan on Today at 05:35:27 AM

How much would it cost to develop if I want it to grow organically and under the radar?

The actual cost of creating a successful project is being measured on the money and time you've put into effort in creating them and how are you going to sustain the project development team in the long run. You should also consider that in the latter part of you project you need to spend another fortune for the advertisement and promotional stuff that will enable the project to expand if and only if the project has a real use case and can somehow solve a problem.

Most of the start-up project failed because obviously they are targeting an easy get rich quick rather than the development of their project to solve an underlying problem.