Study ballet for the basics. Turning, jumping, placement, kinesthetic sense, musicality and presentational styles. It makes your body strong and adaptable. Check out the choreog in the stage production of The Producers for example, strong classical technique required there, even though it was mainly jazz.
Tap is also great but you have to be amazing for work at the top.
Please be sure to check the FAQs:
Looking for work?
Agents and agencies
Finding an agent
Where are the auditions?