まず - First of All

The word まず is used at the beginning of a sentence or phrase to mean "first of all", "to begin with", or simply "first." How simple!

朝、起きたら、私はまずコーヒーを飲む。
When I get up in the morning, the first thing I do is drink coffee.

学校に着いたら、まず先生に話さなくちゃよ。
When you get to school, you need to talk to your teacher first-thing.

今日はみそ汁を作ります。まず、次の材料を準備して下さい。
I'm going to make miso soup today. To begin, please prepare these ingredients.

まず、お兄さんに謝らなきゃんだよ。
First of all, you need to apologize to your brother.