I definitely encourage you to consider the questions Harris raised. Also, is there a particular age group you’re looking to attract for your fitness classes?
From the boot camps/group fitness classes I’ve organized and instructed in the past, I found the following list of props to be the one’s I’d consider most essential:
-Medicine balls or Sandbells
-Jump ropes (to use for both jumping and other cardio drills/games where they’re used as an obstacle on the ground)
-Cones (but you could really use dumbells or Sandbells in place of these for a variety of cardio drills/games)
-Exercise tubes (in a few different resistances)
How does that list sound to you? Do you feel you’d be able to provide a variety of exercises to your participants using just those props?
Best of luck to you with your group fitness classes!