Step 1: Get help. Start figuring out what you don't know. An app like this, especially if it were wildly successful in attracting users, could do a lot of harm

Step 1: Get help. Start figuring out what you don't know. An app like this, especially if it were wildly successful in attracting users, could do a lot of harm if the underlying idea isn't thought out well and based on good ideas. You're 15. You love your idea and the competition judges did too. Great! Are you or them experts on suicide prevention? Fortunately, your goal isn't to make money or something similarly self-serving. You're trying to save lives. That opens up tremendous resources to you what would be denied to most trying to make their first app. Psychologists, doctors, professors, etc. will all be happy to help you get the idea right, free of charge, because it could save lives. If you see a psychologist, ask them for their input and ask them for contacts. Go to your local university and knock on doors. Find people who teach or do research in the field and ask for their input. Make some phone-calls. Email professors at other universities. I know your instinct is to immediately try to advance your idea towards a working app, but a great app based on a faulty idea is usually pretty useless and this one could actually be dangerous. Get help immediately.