1. Have them learn where all the notes are on the neck.
2. Teach them the basic chords.
3. Teach them the basic scales.
4. Teach them how to use scales with chords.

I've found that most students don't want to learn this stuff, they just want the instructor to teach them songs they want to learn. Every student is going to be different, so just ask them what they want to learn, whether it be theory, certain songs, how to improvise, etc......But let them know that it will pay off a lot more to learn the notes, chords, scales, and how to apply them.