You can start learning easy grammar, then will gradually step up one by one. This book is also designed to acquire 80 kanji along with studying conversation and grammar. It also has useful tips and points for those teaching Japanese in the various parts of the text.
The book comes with a CD containing scenario-based conversations for each chapter. Listen, read, practice, and do the simple exercises that will help you remember what you've learnt. Whilst this book is good for working on with a Japanese friend or teacher, you'll also get a lot of benefit from it through self-study.