Tell me the do's and don'ts of this business.

告诉我这次行程应该注意的事情。

All right. For starters, do be polite to your customers. And don't ever raise your voice no matter how nasty your customers get.

好吧，首先对客人一定要有礼貌，不管客人的态度多么恶劣，绝对不能对他大声。

All right. Anything else?

好吧，还有吗?

Take care of yourself.

照顾好自己。

customer 凡顾客，主顾

nasty a.令人讨厌的;困难的;恶劣的;下流的