Mushroom crop - training/advice

Hi this is mahesh, I completed my post graduation. I want to move on agricultural field, I have no Idea on this field but I have interest.
I want to go for Mushroom Cultivation,so anyone can please suggest me on this crop. where can I get training especially in Andhra Pradesh
How much I have to invest, what is the production cost and sale cost will be? how is today’s market on mushroom cultivation?

or Suggest me as a beginner which crop is suitable/better to me with a low investment?