First things first.

要事第一。

Go by the book.

照章办事。

First come, first served.

先到先得。

Everything has its season.

万物皆有时。

Rules are made to be broken.

规则是用来打破的。

When in Rome, do as the Romans do.

入乡随俗。

Don’t put the cart before the horse.

不要本末倒置。

Let’s cross that bridge when we come to it.

船到桥头自然直。

Don’t count your chickens before they are hatched.

不要高兴得太早。

A place for everything and everything in its place.

各得其所。