Number of recs was already answered in your
previous thread. Also, read
this thread.
I am not familiar with your school, but note that you are not the one sending the recommendations. Your sponsors who write your recommendations will submit them.
Perhaps someone with Mizzou experience can address a deadline, if any, or you can call the office of Greek Life at your school and ask them for some guidance. Many rec-heavy schools have a July 1 deadline.