Finding a local partner or setting up a local office is the key for success there, as the locals can manage local relations, regulation, market dynamics, etc, much better than foreigners. And, you might want to build your e-commerce website for the local market, and to hire local marketing company to market your site. Meanwhile, you might want to think about the import/export process and other logistics of doing this business oversea.
I am from China and has done business there. It is not a small task to market a product oversea. Market is competitive there, but there are some special new policies are offering competitive advantage in Shanghai for the import/export business. We can discuss more when you are ready to go to that market.