Your business startup should be about what you enjoy doing. I've read quotes of successful billionaires, and their number one suggestion on a business startup was what you enjoy the most. If your business startup consists of something else that you don't find enjoyable, and sees loses in its first establishment, then you'll naturally give up your goals of entrepreneurship. You wouldn't give up if your started a business selling what you enjoy most.
You should formulate research based on what is the most profitable business in your region, because you don't want to invest a lot of money on a business that's not popular within the region you live at. I would suggest you to explore markets and ask people what they demand most. This will help you create a marketing plan, which will show you the list of demands customers want and will accelerate your business growth. Actually, if you do market research on this and submit it to you investors, it's likely they will invest in your business, increasing your capital, though your research should be academically accurate.