Phone [Q] App Promotion in China

We have developed an app in Chinese. But faced with the fact that, firstly, China has no Google Play, and, secondly, the promotion of the apps is rather complicated. Maybe someone has experience of entering Chinese market:
1) On which Android app stores do we need to publish our app?
2) Are there any app review sites in China?
3) How to promote apps through Chinese social networks?
4) Are there any companies that offer app promotion on Chinese app market as a service?
5) Does it make sense to enter Chinese market at all?