First, study the vocabulary and grammar of a lesson in the main Minna no Nihongo book. The Renshuuchou is a tool, not a replacement.
The Kanji Renshuuchou (漢字練習帳 – "Kanji Practice Notebook") is a supplementary workbook designed specifically to accompany the main Minna no Nihongo textbooks (Shokyu I & II – Beginner Level 1 & 2). Unlike general Kanji dictionaries, this workbook is perfectly synchronized with the vocabulary and grammar lessons in the main series. minna no nihongo kanji renshuuchou pdf