Paid traffic, such as PPC or banner advertising, is usually more controllable and scalable. If what you're doing is working, you can spend more to grow your traffic. It also has the advantage of being able to start very quickly, if not immediately. The main disadvantage of paid traffic is that it can be quite expensive and requires a lot of supervision to avoid losing money. Paid advertising platforms such as Google AdWords can also have strict requirements regarding advertisers and ads, so be sure to pay close attention to all rules and warnings.
You can absolutely use websites like eBay and Etsy! Try listing some items and making a professional Facebook page for yourself with a link to your eBay/Etsy pages. Then share the information with friends and family and get them to spread the word to people they know. Also, make sure that you have detailed descriptions and multiple pictures with anything you list online. This will help your listing show up in keyword searches, and you are more likely to sell something if the buyer knows a lot about what they are looking at.
5. Fiverr – Fiverr is a great place to make a few bucks or spend a few bucks if you need some of the services people offer. Basically, everything is $5. You either pay $5 or charge $5. They call them “gigs.” You can offer your services however you choose. If you sell art and you’re fine selling pieces for $5 each, that’s a gig. If you’re a graphic designer and you want to offer your services for $10/hour, simply offer a 30 minute gig. If they need two hours of graphic design, they pay you $20, or $10/hour by buying four gigs.