My tip: provide a bit more information about what people can expect. With all of these types of self-improvement programs (I think of the MITX and Coursera and Udemy courses back in the day that had rigid schedules and coursework due) you can expect a large dropoff between sign-ups and continued effort in the program as the weeks progress.

I think providing a bit more detail about what people will be required to do and what they will receive might help combat that problem (though obviously not solve it).