Lesson Planning???!!!

Hi, there

So, I am part-time piano teacher with about 24-25 students. While I'm teaching, I'm also doing my masters in music on piano teaching and working as an admin person.

My lesson planning system is horrendous. I get overwhelmed with everything I need to do and my lessons aren't nearly as fun or efficient as I know they could be. So, I wanted to find out from my peers: how do you lesson plan? What system do you use? Do you try and keep all your students in the same pace? How often do you sit and plan?