The prep work before you open up shop is more time-consuming. You need merchandise to sell, photos and descriptions to post, a name for your shop and a business plan to help you succeed. Once that’s done, you’ll still need to find customers. Depending on what you’re selling, that could take weeks, which is why you should expect the overall time for this gig to be slow.
Don't sacrifice morals for a quick buck — At the outset, you'll want to do all sorts of things to make money online, but don't sacrifice your morals for a quick buck. Not only will you put people off, but you'll lose Google's trust. You also shouldn't concern yourself with things like Adsense or other ads on a blog before you have around 100,000 visitors per day. Yes, per day. 

Craigslist. Craigslist is the scrappiest of the major online resale options. Its major perk is its enticing profit potential, thanks to the total lack of listing and selling fees for most items. The disadvantages are many and include potential safety risks and higher chances of nonpayment. If you do choose Craigslist, keep your wits about you and use the buddy system.
EBay. EBay is one of the most popular websites in the world. That means it’s an excellent way to attract lots of eyeballs to your unwanted items, fast. Initially designed as an auction site for DIY sellers, it’s now primarily a venue for fixed-price – and often heavily discounted – sales by professional merchants. As long as you include high-quality photographs and thorough descriptions in your product listings, you can likely break through the noise. EBay’s fee schedule is complex, but as a general rule, expect to lose 10% of your final selling price to the site’s commission.
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