Praise be to Allaah.
There is nothing wrong with supervising educational and
training courses in the manner that you have described, and receiving
payment in advance. This is a kind of hiring which the scholars call “hiring
for a specific task”, the aim of which is work that has been agreed upon
between one who is hired and the one who hired him, without any stipulation
that the work should be done by a specific person. The scholars are
unanimously agreed that it is permissible to pay the entire fee in advance;
in fact, some of them -- such as the Shaafa’is -- say that this is
obligatory and regard it as a condition of it being permissible.
And Allaah knows best.
See: al-Mawsoo’ah al-Fiqhiyyah, 32/286-287
And Allaah knows best.