The first part of any digital photography lesson plan is getting to know your equipment. It is difficult to proceed with any level of competence if you do not know how to use the equipment that you will be using so taking time to show everyone how the equipment works and what each feature is will go a long way to making sure everyone is on the same page going forward. If you research and lay out this part of your digital photography lesson plan correctly then even the most advanced students you have should learn something and you would be amazed at how fast you can get the attention of an entire class if the advances students are learning along with every one else.