Well, I'm only 16, and I've only been teaching for about two years, but my general experience has been that if you make the lessons fun, the kids will want to practice. I have one student, and she just loves to play hymns. So, I got her a couple of hymn books, and we use that as our sole lesson plans. Another students loves Disney (c) songs. For the younger students, I like Beanstalk's or Music for Little Mozarts. If you bring it to their level, and make if more like play than practice, you won't have any problem. Also, if a student isn't practicing, make sure that you really encourage them to play just 10 minutes a day. They sit down to do that, and then they generally get carried away. Music is such a wonderful gift, that it's a shame and a crime to make it fit in a little box, and make everyone do everything the same way. Isn't music about expressing yourself?
Anyway... My main keys are:
Find music the students enjoys
Make it fun
DOn't be to picky about EVERY little thing

Also, I live in a very rural area, and there aren't many other teachers around... My teacher, and that's about it. Anyway. I charge $5 for a half-hour.!