Fetching details from the dictionary...

first; firstly; first of all; to begin with; in the beginning; at the beginning
Introduction; Preface
初めに自己紹介をさせていただきます。
First of all, let me have a moment to introduce myself.
会議の初めに今日の議題を確認しよう。
Let's confirm today's agenda at the beginning of the meeting.
初めに注意事項を説明させてください。
First, let me explain the precautions.