i use and have been using the book Bass Guitar by Gregroy and Vinson (IIRC) to teach for the past twelve years.
the way this book is written and set out makes it easy to help someone find their way through the potential maze of techniques and 'great songs'
all of my pupils, past and present have learnt huge things from this book, and it is a great starting point to start peoples creative juices going whilst learning basic techniques.
I'm not suggesting that you go through this (or any other) book verbatim, but it has exercises that progress logically, and will open discussions into further things.
the essential thing is that if you are going to use a book as a springboard, it must suit YOUR teaching style, and the skill of teaching is how you teach you student to apply the lesson / technique / song to their style, and how well it sticks in their playing over time ( subject to practice of course!)
In doing this each lesson becomes relevant to each student, and as you get to know your student better, you will be able to suggest ideas / styles / players that they have never heard of before, which will encourage them on their own musical journey.