Decluttr lets you sell everything from books to CDS to DVDs to electronics and even LEGO! It's my best recommendation for decluttering (hence the name!) by selling stuff you no longer want or need. With books, you just enter in the barcode or ISBN and they'll give you a value. It takes minutes to find out how much your stuff is worth and you don't have to register or anything to price things.
Do you know there are companies and people out there that make some pretty good money offering their cleaning services to households and companies? They'll come in and charge you either a set fee per room or an hourly fee to clean up. They can come weekly, monthly, or whenever you think you need some extra scrubbing. What's the point? Why not have the person they hire be you?
Next, you need to set up and build your YouTube channel. Your YouTube channel is your homebase for all your content. If you already have a Google account for Gmail or Google Drive, then you can use that to log-in to YouTube and start setting up your channel. Pick a username that works for you and is memorable (if you’re using an existing Google account you’ll have to edit your username in Google+).
Upwork: This website offers a great marketplace for selling just about any professional service. You don't need a merchant account, website of your own or anything else for that matter. All you need to do is be able to provide a high-quality service at a reasonable price. But be informed, you will have to compete with many others that are constantly bidding on open jobs.
The two popular ones are Poshmark and TheRealReal. Both make it dead simple to sell (and buy!) luxury items. The RealReal will pay you 60% of the sale price (more if you sell a lot) and Poshmark has a tiered commission structure. Sale prices under $15 pay a $2.95 flat fee and everything else is just 20%. Tradesy is another company and they take just 9%.