In a small small nutshell:
- Refine your business model, sketch up a minimum viable product (MVP).
- Build and offer the MVP, test and record market response. If it does not gain significant traction, change your model/product, until it does or let it be.
- If it gains significant traction, talk to the investors. Tell them that you need money to scale and execute the product fully.
If you need more advice on how to go from idea to business model to MVP, just ask.
See the answer on Quora: