I think it says you're on the right track. In fact, I think you should also move it up a notch and think in terms of 1/8 notes. These are the upbeats, and you will be into them very soon as you advance in the book. They make syncopation possible, which is where it's at and the sooner you get it in your bass brain the better. It's simply the beat when your foot is up (or hand if you are drumming) when you are counting 1/4 notes. But take it slow and don't get discouraged. I have gone through all three books and think it's the best!