How to earn 10 crore rupees in 20 years?

My current income is 3 lakh INR per annum. I want to be a rich person at any rate. I am ready to do any kind of hardwork. I have heard of self-made businessman. I just want to be like that. But I have no idea how to start. Pls give me a blueprint for making a huge money. Who have such experience of becoming zero to hero, pls help. Only legal ideas are prefered.