E-books represent about 20 percent of all book sales in the U.S. The good news is you don’t have to be a publisher with deep pockets to get in on the action. As a solo internet entrepreneur, you can sell ebooks directly from your own website. You can sell your own works or sell a public domain work. Simply upload it to your website (or seller account on Amazon) and start publicizing it on your social media platforms, on your email list, your blog, website, etc.
Below is a huge list of companies (over 90!) that do mystery shopping, remote call monitoring, or some other “customer engagement research.” We did not vet the companies on this list, we only checked that their websites loaded and that they appear to still be in business. I wish we could've researched this more but that just wasn't feasible. Before you sign up for anything, please review my post about how to spot a mystery shopping scam plus the Federal Trade Commission's tips.
Serve as an online juror. Some attorneys use large panels of online mock jurors to get feedback on their cases before they go to trial. However, the mock jurors must live in the county or federal district where the case will be tried. You can sign up at a couple of sites and receive e-mail notifications if a case is posted in your area. EJury.com pays $5 to $10 per case via the online payment system PayPal. You can't be an attorney, paralegal or legal assistant – or even related to an attorney – to participate. EJury says you're likely to have better luck getting picked if you live in a large metropolitan area, where more cases are tried, rather than a rural area. The average case takes about 35 minutes to review. At OnlineVerdict.com, where cases typically take between 20 minutes and one hour to review, fees range from $20 to $60. Payment is made by check.
Become an Amazon Associate and then use Keyword planner to find an in-demand niche: With more than a million different products to choose from and up to 10% commission the sales you drive, Amazon’s affiliate program is a great place to get started. Browse their available products and see what connects with you. Or take it a step further and use Google’s Keyword Planner to quickly check how many people are searching for a specific term. With affiliate marketing, the more relevant traffic you can pull in, the more you’ll make off your site.
Find a profitable niche. Starting with your interests, write down as many niche ideas as you can. Think about topics people might search online. Ideas include passions (like surfing or body building), fears (like spiders or speaking in front of crowds) and problems (like getting out of debt). Do keyword research to see it others are interested in the topic. Find out if a domain name is available that matches the keyword 100 percent. 
One of the cool things about Google AdSense is that it's so easy to get set up. If you have a blog or website, you can sign up for a free Google AdSense Account. From there, Google will give you a unique code that you will paste onto your website. Google takes it from there, tracking your page views, traffic, and earnings on your behalf. There is no upkeep or maintenance to get this thing going, which makes it a no-brainer if you have a website already.