Good for you!
If you would like to get your license to teach Zumba, the first course is called B1 – Zumba basic. If you go to zumba.com, at the bottom left of page (scroll way down), there is a link that says “become and instructor.” Click on that, and you can search for trainings available in your area.
Zumba’s basic license gives you permission to teach their format and use their brand name. It does not, however, teach everything you might need to know about running a safe and effective group exercise class. I would also highly recommend that you obtain a certification in group exercise instruction. ACE, AFAA, and ACSM all hold good ones.