The First Step
First Step
noun
第一 is the first thing. 段 is a step. So, this is the first step.
だいいちだん
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
第一段階として、まずは基本の復習をしなくちゃいけないかもしれない。
I may need to review the basics for the first step.