My Mandarin Chinese for your EnglishHi
I would like to find an english teacher for my preschool kid so you are interested in improving your Chinese contact me.
1) it is illegal to hire a foreigner for ANY work unless you provide the correct visa.
2) most foreign people who fall for this find that when it comes to the 'learning Chinese' part of the deal, the Chinese person invariably is 'unavailable' or 'too busy' to hold their end of the bargain.
3) no offence, but if you are not a professional Chinese teacher, I would not see this as a equal exchange of skills.