A REST service, like any service usually has inputs and outputs. Follow the links below to learn how to setup REST service to use in a mobile app. In general, creating a service consists of the following three main steps: 1) entering service URL, 2) defining request parameters, 3) defining response parameters. Once you are done reading on how to create a service, learn how to use a service on a screen. 

Using Tigzzi Proxy (to simplify development and testing)

Understanding JSON, JSONP and Tiggzi Proxy - read this if your service works when testing but doesn't work when running the app.