You need to take a Zumba gold training. You can do “Jump Start Gold” where you get licensed to teach Gold, or you do the basic first, then you need to take another course in Gold. From this link: http://www.zumba.com/en-US/trainings you can choose which training and where you take the course.
Whatever you decide I would highly recommend you get certified as a group fitness instructor from an organization such as ACE or NASM. Zumba is great, but I do not believe their course is enough to prepare anyone to be a safe and effective group fitness instructor.
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.
Since your post about Zumba Gold was nearly 5 years ago, I hope you got your B1 license and your Gold license and continue to flourish in your Zumba career.
Are you still teaching Gold? I’m a ZES for Zumba Gold in the Pacific Northwest and a ZIN Jammer for Gold in the US. If you’re still teaching Gold and need some inspiration, you have several Gold jammers on your side of the country – Ann Saldi and Natalie Kikkenborg. Look them up if you need choreo ideas for your classes.
Re-reading your question, for any Zumba training that you don’t want to travel, consider the option of hosting the training yourself. It’s pretty easy. I’ve hosted Zumba Toning twice, Strong by Zumba, Zumba Gold five times (and now I’m a CEC provider for that format), as well as over a dozen jams. When my kids were little and I couldn’t travel, I brought the trainings to me.
This advice works well for non-Zumba formats, too. I’ve hosted U-Jam, ViPR, Stroops, CrossCore, Bokwa, QiDance and QiForze, among others.