A good idea would be to ask around others who teach this type of classes close to you (if applicable) and get the information you need. I’m sure there are places in your country where they do certify instructors in Bollywood dance. A quick search online would also give you some good options. Hopefully someone else has a better answer for you.
Here are a few formats. You can look at whether they offer trainings in your area. Or google bollywood dance instructor certification.
http://www.monakhancompany.com/bombayjam.html – I think I saw these guys at IDEA 2012 and they were very good.