I've spent some time there. Language is difficult, but not impossible. Depending on your business, you may need ongoing interpretation help. Especially out of the main centres. The business people I have dealt with have all been good and very eager to do business. I found the entrepreneurial spirit alive and well there...and very hungry.
Speaking of hungry food is good in hotels and a few of the big restaurants...move beyond those and you get into restuarants that shall we say would not get a City of Toronto Green Pass Card. Having said that, apart from some diarriea...no problems. Take Immodium.
Environment is not a big issue there, or at least it wasn't a couple of years ago. You will find lots of pollution...air and particularly water...some places off the beaten track the smells of inadequate sanitation systems are pretty noticeable.
Can't help you on the hobby side...never got a chance to try it. I believe it is available but not obvious.
If you have the chance to experience China...go for it. An amazing place, not to be missed at this stage of its development.
Hope this is useful.
Shades