Wow this is a topic that could go on for a long time. There are so many elements to being an effective educator. Our roles change for every student. First of all a clear set of goals is most important. These goals change depending on the level of student but to have a clearly defined list helps keep you and the student focused. Maybe include elements from a list like: sound, technique, scales, arpeggios, sight reading, prepared music, rhythm, and improvisation. I like using charts or graphs to mark the progress of a student, this keeps them on track and it is always fun to look back at how much you've accomplished. For younger students having a grid that you fill in with smiley faces or stickers might be good. Make 12 squares, one for each major scale, and reward them when the chart is filled in. Always end a lesson with somethng they want to do like their favorite piece. Get involved with music that they like but find a way to introduce important topics to these "fun" songs. If it is a simple melody like "Happy Birthday" why not try to teach it to them in more than one key, challenge them to learn it in all 12. If you're working on rhythm maybe have them notate their favorite song in rhythmic notation. Combining practical saxophone elements with music they love will keep everyone happy.