Who will teach the classes? Well in theory the curriculum would be well made enough to not require an expert to teach. But, I envision having a few different instructors on staff for the different areas. For example, bringing in a personal trainer would help with fitness/nutrition.
The curriculum I have kinda dabbled with working on, but it would have to be adjusted for the actual "class" that is being taught. I bet with some time I could put together a really solid foundation of a curriculum just from my own experience and a good amount of research. For example, I spent a week with a freshman at the beginning of the year last year and was able to provide substantial value with just my general knowledge and experiences. With success, considerable time could go into putting it together, consulting with experts in each area would make the material much stronger.
Getting the word out to interested students is also a good one. Depends on which vehicle is being done. Could sell weekend camps to a high school directly or for the summer camp, advertising at elite high schools and the elite colleges students are getting into would work. I think filling a first group would be difficult, but a decent reputation and only... 50 available slots for a summer would be filled easily.
Thanks for reading!