#1. For us, the top 3 are GoAPK (anzhi.com), GFan (apk.gfan.com) and Tencent App Center (http://android.myapp.com). Between them, they're >90% of Chinese 3rd-party app store downloads.
#2. The biggest hurdle is that everything is in Chinese. I'm not sure how hard it would be to get paid if you're not in China, but as athgeo says, Chinese users really don't like to buy paid apps - even in the iOS app store our free-to-paid ratio for China is literally 10 times worse than the US, and Android is even worse because the users are less likely to have money. So it's probably best to concentrate on ad-supported apps.
#3. If anyone has good advice on this, I'd like to hear it.
#2. The biggest hurdle is that everything is in Chinese. I'm not sure how hard it would be to get paid if you're not in China, but as athgeo says, Chinese users really don't like to buy paid apps - even in the iOS app store our free-to-paid ratio for China is literally 10 times worse than the US, and Android is even worse because the users are less likely to have money. So it's probably best to concentrate on ad-supported apps.
#3. If anyone has good advice on this, I'd like to hear it.