im 24yrs old(girl) im B.com MBA finance. i want to start my own business so, what bus

I can't believe that you have an MBA and no ideas for a business.
What are your interests in life? Your business should be something you really like, not what you think is the best way to earn money. Most of the success will come from your interest in what you do.
When just starting out, you could consult to other new entrepreneurs, since you obviously know how to get started.
What part of the world are you in? What products is your region famous for?

my specialisation is finance, i dont have much knowledge about product to start with it, manufacturing of product could be possible by engineers, so im confused what to start, their is only banking sector & financial institutions these are big sectors & require huge investment, so i need some ideas related to my profession & which is affordable.