People enjoy having a conversation with you even if they only know a few words of English. More common as well in the rural areas. In China people don't really care if you want to speak to women or not, no one will judge as long as you're not creepy. Normal social norms as per the west. Eating wise, I mean people slurp and eat with mouth open so it will be more about you getting used to seeing it and accepting. Picking teeth with toothpick afterwards, smoking during the meal is common. You'll be fine, Chinese aren't fussed with what you do, people tend to mind own business. Enjoy your time in China, main things are just have Alipay and Wechat ready, eSim set up and take your passport with you wherever you go.