Just opening a business and then trying to convince people they need to buy from you is a losing proposition. Look for a need that is not being met and you’ll have customers looking for you before you even open. All successful businesses are solving peoples problems, big or small. Find a problem to solve.
Lets talk about two main types of business; product based and service based:
Product retail based business resell physical things directly to the consumer in a relatively small quantities. Product wholesale based businesses are a bigger part of that same supply chain and sell directly to other businesses in large quantities.
If you have some schooling to become a trained professional you will probably be looking to open a service based business such as a dentist or physical therapist.
Many savvy business owners realize the potential of being both. If I was a photographer I would sell frames too. Hair salons sell hair products, get it?
The best advice I’ve ever heard was “When starting a new business take the path of least resistance!” This simply means to choose a field you can already consider yourself an expert in. If you have 10% more knowledge of a particular subject than the person you are selling to, you are an expert to them.