<human>: I'm thinking about starting a business selling t-shirts online. What should I know before I start?
<bot>: Before you start, it's important to do research on the market and competitors in order to understand your target audience and how they will respond to your products. You'll also want to consider the legal requirements of setting up a business, such as registering with the local government and obtaining permits. Additionally, make sure you have enough capital to cover startup costs and any potential losses. Finally, create an effective marketing plan that includes social media campaigns, email marketing, and other methods to reach potential customers.