I hate to tell you this, but many of the dancers on Broadway are retired ballet dancers or academy trained ballet dancers, who couldn't get work in the ballet. I know of 3 classmates of mine who are doing just that. However, it is not nessecary to be able to dance like that unless you were auditioning for someting like West Side Story. The more dance you have, the better. You should take at least 2 ballet classes a week to start. Once you build some techinique, you should start with adding some theater dance classes. You can take tap right away without the ballet. Good luck.