First year art Teacher

So I am entering my first year of teaching. I teaching at a small private school that is university model. That means we only meet three times per week, and I get a new class in the spring. So that’s one struggle I am trying to work around. The other is that I will be teaching both middle and High school.

Does anyone have advice on how to navigate this? My best thoughts are to use the exact same curriculum, but have a “easier” version for middle school and a “advanced” for High school.