1. My method is use xplore file manager then delete manually all the apks. Of course you need root.
2.http://en.miui.com/thread-37195-1-1.html
3. Search miui forum.
4. Install Google services.http://en.miui.com/thread-3998-1-1.html
5. Think not available yet but try search in miui forum. Surely...