Android Taxi Order Design

Dear Friends I am writing an android application for ordering taxi and I need help with the desing (I am realy bad with desing). Brief Description User order a taxi and after a while get notification about a taxi driver/station that will provide him a service. I need help in designing the interface to the user. Desing includes: Writing the layout xmls for the activity, Designing the buttons. Design markers for the map. Desing details markers for the maps, when ordinary marker pressed a detailed makers appears. Design the representation layout of all information. Desing icons to help represent the data. Use case: On Activity start - A google map with a marker representing the user location. Address information about the user location. A button for ordering a taxi. Order button pressed - order button disabled/disappear a cancel button is available (could have been visable but disabled, what ever looks better). The server update about stations/drivers that been informed about the user, as a result the information will be displayed with markers on the map. Server send information about a station/driver that accpted the call, the detail information will be displayed somewhere, this include the service provider's : Name, Phone, Address. The phone will be represented with the ability to make a phone call. A Done button is added, the user can either press cancel or press done. I will be happy to answer questions. Thanks and Best Regards Eylon