What I have to get to be certified or locenced Zumba instructor?

The ZIN membership will be explained in more detail at the instructor training, but it is something I would recommend. It provides a lot of online resources you can use for any questions you might have after going through the instructor training. As a ZIN member, you are given the opportunity to take additional instructor training classes for Aqua Zumba, Zumbatomic, etc. That is a definite plus!
I also received my Primary Aerobic Certification (Group Fitness Instructor) through AAAI in order to build up my resume and learn more about group fitness classes.
Good Luck!