Which stream should I opt in 10th to become a businessman and writer?

Both in one go? At this stage focus on one and pursue it to get known. To become a businessman, go for an MBA degree to start with. To become a a writer, pursue language courses. Remember, writer may not have a good career. A few succeed.

It is an interesting combination. but both of them are skill-oriented.More than a qualification, they require your individual inclination. A business man can develop his writing skills by keeping writing as hobby simultaneously. For writing, the is a need for a command over the language and this you

You can go for Commerce field