Mobile App & Website Development

We need full mobile app and website development. We are taking proposals. We have a business idea for a movie distribution. It is a USA based multimedia Firm that wants to operate 24/7 Video and Radio channel, Multishow podcasts, daily blog, and video on demand. We are currently reviewing our plans and ready to take up proposals. We would like to know how freelancers can help us to come up with topnotch app solution (Netflix alike). The cost implications ? Reasonable amount. We would like to have it on 1OS, Android, Roku, Apple TV.across all platform with a gateway payment.