Have you considered taking Jump Start Gold? That gives you your initial Zumba license AND your Gold license in one training. Much cheaper than taking the two trainings separately.
If you take B1, the basic Zumba license course, you will have to take Zumba Gold as a separate license, over and above your B1 license.
Whether you do Jump Start Gold or B1 and Zumba Gold separately, in order to teach Zumba Gold, you’ll have to be a member of ZIN, the Zumba Instructor’s Network.