Big data -Kindly guide me how will start

Hi Durga sir,
Hope you are doing Great!

This is Vinoth , I am in a recruitment filed past 4 years (BE ,ECE -2012 pass out) and looking to change my career in Technology either Admin or development , I do have basics knowledge of Java and C# (self study).

Kindly guide me how will enter Bigdata world…i need to do both Admin/developer certification (For Admin need hands of Exp ) or developer certification will enough find opportunity?

i really confused , Kindly guide me where i can start and how will study Bigdata.

Thanks in Advance!!