I am not interested in doing a job. Which business can I start after doing MBA in marketing and HR?

For that, you need to decide where your interest lies. There are a lot of departments where you can invest after you have completed your MBA. Once you go through with your MBA you will have more details about where you can invest. You also need to know your market well. So, study your market and see

If you have completed MBA in marketing and HR then you are capable of managing marketing and human resources, this is not like you are only determined to specific businesses, you can start any of the business in which you have interest, these qualifications will definitely help you in managing that