This normally tends to happen around Peoples Square and East Nanjing Road where there is a high concentration of foreign tourists. With the Tea shop itself often being a back alley one within walking distance of these areas. Thankfully I was warned about this sort of thing on my very first day in China and am naturally skeptical of people who just walk up to me out of no where. But there have been a few occasions when I’ve been in these areas and someone as come up to me and asked me if I wanted to join them for a tea ceremony they where on their way to. Try to get as many as possible so that at the time the brand becomes big, someone else is not sitting on some domain name and hijacking the brand. Don’t settle for .in if .com is gone and there’s an active website there. I can only recall one I’ve been to that exclusively focuses on tea, and that’s Tealuxe in Harvard Square, on Brattle St. Very impressive tea selection, knowledgeable staff, and good service. All in all a great little shop. I was there in April 2011 and again in April 2015, when that major earthquake happened killing so many. Trust me the entire place had changed drastically in such a short period and almost unrecognizable for me. Even if you fulfill all criteria required to open a tea house, I request you NOT to do it. There are more than enough already present there and the entire route / region looks more like a market than a trekking route.