Learn then selling guidelines. Each marketplace has guidelines that define what you can and cannot sell. State and federal laws also impact what items are prohibited. In general, you cannot sell alcohol, weapons, service contracts, animals or event tickets. Also, while not always prohibited, you may find restrictions on how you can sell items in some categories, such as art, gift cards and coupons. eBay, Craigslist and Amazon publish these guidelines on their websites.
Traffic is the heart and soul of a business. Without traffic, you simply aren't going to make money online, regardless of what you're selling or what business model you're using. There is a completely separate tab for traffic in the members area, so I had high expectations. However, it's limited to a few videos about Facebook Advertising, then some stuff about Instagram.