For parents who want to create professional player

How to develop good tennis player? How to support your kid in his wish to be professional? How to avoid problems, when practicing becomes really hard?
Having big experience with the different players from their young years, I will happily share it with all, who wants. My best student - Elina Svitoilina - with the big help from her parents became World #3. I had a lot of less successful players. But all of them might get better results, if their parents did necessary things in the vital moments.