So I take it that you're seeking out Chinese supernatural ghosts in general rather than Chinese mythological creatures? (Chinese legends make a distinction between both. Mythological creatures are more closely associated with the Chinese mythological gods, like Yu Di / The Jade Emperor or the God of Rain Yinlong, who is also a dragon. Chinese supernatural ghosts have nothing to do with the history of gods for the most part)
A big majority of online sites that deal with these are in Chinese, so if Google translate doesn't work you can't find too much. Here's a couple of things I can suggest, though:
Mythological Creatures
Journey to the West - it's a popular Chinese story (one of the 4 great novels of China) that's spawned numerous TV series, anime, what-have-yous in Asia. If you're familiar with Dragonball, the main character is based on Monkey, the lead character in the novel. I only mention this because in the course of the story, the characters meet a lot of mythological creatures. I'm not sure if there's an online translation available, but maybe a local bookstore would have one?
You can find a compilation of other creatures in Wikipedia:
http://en.wikipedia.org/wiki/Chinese_mythology
Supernatural Creatures
I would suggest looking for this book called Strange Stories from a Chinese Studio, which has a plethora of ghost stories and odd creatures. Any Asian bookstore should know what this is. Amazon might also be a good place to look.
My favorite Chinese ghost though, is the Jiangshi, also called the Hopping Corpse/Ghost (because rigor mortis has set in, and it can only hop about).
Chinese creatures don't really have an equivalent of fairies or brownies - the closest are often ancestral ghosts. The best I can think of are fox spirits, which tend to be mischievous rather than scary or malevolent. (Occasionally, they fall in love and turn into females and live with their beloved for awhile before they are eventually found out)
There are also the tennin (which tends to be more Japanese-flavored than Chinese, but originally stems from Chinese Buddhism), which are beautiful maidens with special celestial robes. There are stories where men steal their robes while they are bathing in the river and force them to become their wives (the maidens can't return to the heavens without their robes)
Hope these help! There aren't much detailed information of these online, so looking for the books themselves are usually the way to go.