Make sure it's legit, no money from you, and make sure it's something that your DD wants to do. It won't be a money making endeavor for a long, long time, considering how much time you will have to put into it. If it's something your daughter enjoys, it may be worth the time and work. It is work for a 4 year old, and she should have a say in whether she wants to work at that age. She may prefer to play, take dance lessons, join a sports team, or go to drama camp.