Redesign the already built Android App with added functionality

Hi, We have a simple android app which is working. The app has functionality to push images to a display panel. It works on Wifi connection (AP mode). From the app we are able to change the password of the wifi connection with the panel. The app has inbuild sample images which we can push to display panel. We want to do following modifications: - Design the screen of the app (not more than 7 pages - 1. Home (Image collection which can be pushed to display), 2. Store (for buying images), 3. Draw images (and push), 4. Change Wifi Password 5. Signup/Signin 6. About and FAQ) along with SPLASH screen - Add images to the app which can be pushed to the display (coding is already done - Need a add images) - Add a functionality in the APP to draw images and then push the drawn images to the panel - Give training on how to add images to the Apps Basic app is already developed and available with us. Need to redesigned with nice looking screens and with added functionality to draw and push.