You can train several different ways..well more than several. There are a lot of options. If you tell me what you want to do I can help you as well tailor it to what you want. But I listed some options below. I wouldn't worry too much about over training unless you are working out 2+ hours a day.
You can do a 3 day total body workout plan with some lighter workout days on day 2 and 4 with focused segments depending on a body part you want to focus in on- calves, glutes, core, hamstrings, shoulders, etc. Just don't focus to heavily on core because too much core work increases the girth of the waist which is why I am advocating a lot of stability core work through weight training to get the benefits of strong core without added bulk. With that being said, a lot of the ballet body segments will not make the waist bigger because the majority of ballet body and iron barre core workouts focus more on stabilization instead of a million crunches. I wouldn't add a core segment to the total body days if you perform 1-2 on days 2 and 4. You can also focus on a body part that was maybe neglected with the total body workout from the day before. I recommend staying with the same 4 week plan before switching the workouts again. Allow your body to adapt. Work harder every week so by week 4 you are working at a 9-10 on a scale from 1-10. This may require more reps, weight, shorter rest periods, etc. Week 1 of every new workout plan can be lighter.
Day 1: Total Body Iron Barre
Day 3: Total Body Ballet Body
Day 5: Total Body Iron Barre
Day 2 and 4 - you can do a core workout, focused glute, etc workout segment from ballet body or body weight segment. Or maybe opt for yoga/stretching/mobility work on one day.
You can also opt for two Ballet Body total body workouts and one Iron Barre workout. If doing this method, I would suggest on areas you want to build more muscle and shape, on days 2 and 4 incorporate weights instead of body weight.
Day 1: Lower Body Iron Barre
Day 2: Upper Body Ballet Body
Day 3: REST or very light workout
Day 4: Lower Body Ballet body
Day 5: Upper Body Iron Barre
Day 6: Core (1 segment) or body part focus - lighter workout under 30 min.
Day 7: REST
You can also just combine Ballet Body and Iron Barre for a total body workout days. Perform 3 total body workouts a week. Do some focused work on days 2 and 4 or yoga. Rest 1-2 days per week.
Hope this helps- you can email me email@example.com if you want help making this plan tailored to your fitness goals.