Do you want to start a business or a profitable business? Even though you might choose the later, most startups end up doing the former. Most of what beginners do is just to start a business. The issue of profitability is usually left for assumption.
Do you want a viable business to start? Have you thought about Manufacturing Business? One of the ways to fight competition in the market place is to manufacture the products yourself. The big brands you see are manufactured products. When you manufacture your own products you equally manufacture your own customers and your own markets.