Think of a product idea and make a detailed schedule. Then you should search for investors and promote your product. Start selling it.
If you're lucky the company gets bigger.

But you seem really interested in an answer. Just to look at your last four questions:

"Starting online business is easy to do?"
"Starting online business is easy to do?"
"What is the way to start a business?"
"What is the way to start a business?"

No, it wasn't me accidentally pasting the title two times each. He just asked the same question several times.