Android Consultation

I'm going to improve my app. But I don't know what to write in specification for freelancers. So, I need someone to consult me. I'm going to create some site, something like [login to view URL] where people can see their post after authrization. I'm going to use authorization from Google. So, a user after authorization can see his posts both from the app and from the site. I already have the app. You need to consult me what should I plan in specification to do this. What will I need for this? I will pay $10 for the assistance. Before you bid, please, install my app to see how it works now.