Car sharing system on mobile platforms

We need a seamless hardware/software solution for tracking and communicating remotely with cars. Our customers will be able to: 1) Log into our website 2) Locate a vehicle in real-time on map on smartphone (iOS and Android) 3) Book the vehicle 4) Go to the vehicle and login via pin code. (In case of PIN code, a unique one-use PIN should be SMS'd to the user) 5) Logging in will enable the ignition. 6) Track the use of that vehicle by the customer in terms of time. 8) The GPS system will be linked to a separate screen allowing the user to not just navigate to addresses and preloaded locations but act as the interface for the customer logging in/out. 7) Allow the user to logout when finished. 8) Automatically generate a bill for each user at the end of the month. Hardware: GPS/GSM/GPRS tracker System: - Vehicle tracking and upload live display on web based map (potentially Google) - Online Booking system that can be plugged into our website (potential for you to offer web development too) - Verification of customer login details - Tracking of user's vehicle use and automatic bill generation. This is a very basic specifications. We know basically what we want the system to do, but it's up to you to come back to us and say what's possible vs. easy vs. expensive etc. We need an identical copy of one the most important car sharing company (Car2go). So take a look on Android e iOS app and website before replying this offer. As you can likely tell we are not a technically savvy company, but we know what we need to do, and hopefully I have highlighted the requirements. We need a firm that can take our requirements, and provide a complete solution including development, programming, manufacture and sourcing of all relevant components. If you have just developed a similar application or you have an interesting portfolio, just drop a line. Feel free to make some smart questions and I look forward to seeing some feedbacks