Ask HN: How do I contact a Chinese hardware manufacturer?

I live in Europe and my boss is starting up a side venture to manufacture some small scale hardware based on cameras (near infrared). We came up with a solution to get our stuff manufactured in China but do not know the first thing about it. So I wanted to ask HN - how do we go about it? Or, are there places in Europe that could be cost-effective or other places in the world? If so, any tips or pointers?