Joking.....the main thing is structure and organization. Depending on the age (you gain attention span as you go up) you won't have much in practice time to stp and think about what you want to do next. KNow what you need to work on and address in practice before you ever start. Another big no no, is never let them get carried away with noise, or talking while you are etc. You will hate your life if you let this happen. If we are talking youth age, your def going to want assistants, so you can give one on one or pod instruction and the rest of the team wont go crazy while your attention is elsewhere. OUtside of that, have a practice schedule, 5 minutes warm-up, 15 stretch, 15 tumble warm-up, 20 tumbling, 30 stunts, run throughs, cleaning etc.