I don't know any training institutes in Bangalore, but what about just signing up to Azure and start doing it. You can get a sample account for free. As long as you keep your databases very small the costs are extremely limited. It's not hard. It's also very similar to SQL Server. A healthy majority of what you learn in SQL Server is immediately translatable. Other than that, hit blogs. I blog on it regularly at Scarydba.com. You can also learn a ton from scottklein.com.