I used this book back before I really knew much theory. It teaches you some basic music theory: rhythm, chords and scales.
Chapter 3 teaches how to read rhythm.
Chapter 5 talks about building basic scales and chords. Honestly it doesn't get much more basic than that. All the music comes with tab so you can use it even if you can't read bass clef.
If you're still having trouble I suggest
www.musictheory.net it has some good lessons as well as reading training tools. best part is....ITS FREE!