Can I have some Taiwan restaurant sentences?
I'm from the mainland. But I think you can use these in Taiwan:

where do I pay?: 请问在哪里付钱？

Table for 3, please : 3人用餐，谢谢

Can I have a look at the manu？  ： 我能看看菜单么？

Can you bring something to drink? : 能来点喝得么？