"Do you have a business card?" 

你有名片吗？

"Could I have one of your business cards?" 

我可以要一张你的名片吗？

"Can I have your business card?" 

可以给我你的名片吗？

Responding to these questions are very easy. You can just say 'sure' or 'no problem.' 

回答这类问题非常简单，你可以就说“当然”或者“没问题”。

"Can I get your phone number or email address?" 

可以给我你的手机号或者邮箱吗？

"What is the best way to contact you?" 

联系你最好的方式是什么？

"Can I get your contact information?" 

可以给我你的联系方式吗？

"Let me give you one of my business cards." 

让我给你一张我的名片。

"My contact information is on my business card. Let me give you one." 

我的联系方式在我的名片上，我给你一张。

"You can reach me by calling the number on my business card." 

你可以通过名片上的号码联系我。

"My email address is on my business card." 

我的邮箱地址在我的名片上。