Hi, I have hands on experience on uploading projects to android market, So I can definitely help you how to make people use it and promote it to the maximum, Utilizing all the Social media API's. Added to that I can do logos, I can provide you some of my works on logos, if required. And the best way to attract people is to make the app free. And making money through the ads displayed via app. Including adsense and other available ads API to the App. Look forward for more details about the app.