Hello,
Firstly, I've downloaded and tried your app Harga Mobil from the Google Play Store. I've worked on similar apps for Windows phone 7/8.0/8.1/10. I've also used both Flurry and AdMob, but they both have deprecated support for Window Phone. I don't think that a proper integration would be possible.
Secondly, I would like to ask why do you want the application to be created for 8.0 with VS Express. Windows Phone 8.0 currently has practically no market share compared to WP 8.1 user base. I would strongly recommend porting the app using modern Visual Studio Community for WP 8.1.
I am offering to create the app for a minimal bid because I am shooting for reviews and completed projects.
Thanks