Wondering how to start a business in Ontario? You're far from alone. Each business has a unique backstory, but many follow this general pattern: The business started by taking on small jobs or selling small quantities of goods or services and gradually ramped up to execute large projects. This is a great way to get going, as it allows you to test an idea before you invest a lot of money and effort. Another method of testing before investing is to buy an existing business, if you can get a good deal.