While it's more about the author's experiences than a "how-to", you could check out this book (Jason Chen's A Tea Lover's Travel Diary: Phoenix Single-Tree Oolong Tea Tie Kuan Yin Oolong Tea
-- http://www.goodreads.com/book/show/8993 ... avel-diary
I'm not aware of any English language books that are a "guidebook" type thing to tea tourism; I think that's probably a bit too specialized. However, several US tea vendors do some tea tours of China and Taiwan. If you're interested in learning about tea but don't have the language skills or connections to do it on your own, this might be one route to go.
When you say Eastern China, do you mean northeast, or southeast; which provinces are you thinking of? More to the point, what kind of teas do you like. If you want to actually visit tea growing areas, most tea growing is fairly specific to certain regions (that is, tea is grown in a lot of different parts of China, but most regions specialize in certain teas or types of teas).