Chinese business emails follow "politeness first": greet, state your purpose, thank, and leave room to reply.
Opening
Use 尊敬的张经理：您好！ or 王总，您好！希望您一切顺利。(Manager Zhang, hello — hope all is well.)
Body
State your purpose in short sentences, e.g. 冒昧打扰，想就……一事与您确认 (Sorry to bother you — I'd like to confirm…). Soften requests with 是否可以…… or 烦请…… (Would it be possible to… / Could you kindly…).
Closing
Common endings: 期待您的回复 (Looking forward to your reply), 感谢您的时间 (Thanks for your time), 顺祝商祺 (Best regards). For very formal mail, 此致 敬礼.
Tips
Make the subject specific; avoid excessive exclamation marks; sign off with name, company and contact details.